The technical setup takes 20 minutes. You create an account, pick a name, write a short description, and hit publish. Substack has optimised this to be as frictionless as possible.

What most new writers spend the next 12 months struggling with is the decision they should have made before opening a browser.

The Question Before You Sign Up

Before you name your newsletter, choose your publishing frequency, or agonise over your logo: who is this for, and what does it specifically promise them?

That's not the same as "what's your niche." A niche is a category. A position is a promise. "Personal finance" is a category. "The investing decisions you need to make in your 30s, before your 40s become expensive" is a promise.

The difference matters on Substack specifically because the platform's growth mechanics reward clarity. Recommendations work when a reader thinks "my friend who cares about X would love this." Notes surface well when they resonate with a defined audience. Writers in adjacent niches refer you to their readers when they know precisely who you serve.

A newsletter that could be for anyone is, in practice, for no one.

Topic-First vs. Author-First

There are two fundamentally different ways to build a successful Substack, and each has different requirements.

Topic-first: The subject is the draw. Lenny Rachitsky's Lenny's Newsletter is the canonical example. He spent years leading product and growth at Airbnb, and when he launched, his audience was immediately clear: product managers and growth practitioners at technology companies. Readers pay $150 a year because it delivers information and access they cannot get anywhere else, specific to their exact job. The newsletter now earns roughly $1.5M a year. The specificity of the positioning is what enabled that. There was no ambiguity about who it was for or why they would pay.

Author-first: The voice and perspective are the draw. Packy McCormick's Not Boring covers business and strategy through a distinctive narrative lens. Readers follow because of how Packy thinks, not because the subject matter is narrow. This model can scale very large, but it requires a more unusual voice and is harder to grow from zero. There's no algorithmic surface to latch onto early. No obvious category where the newsletter surfaces in recommendations, no clear adjacent writer to cross-promote with.

Most beginners default to author-first thinking ("I want to write about several things") without realising that topic-first compounding is much more tractable when starting with no audience. You can always widen your scope once readers follow you, but you rarely get the chance to build that trust from a diffuse starting position.

The Specificity Problem

The most common early mistake is choosing a category instead of an intersection.

"Productivity" is a category. "Mindful productivity for people with ADHD" is an intersection. Anne-Laure Le Cunff built Ness Labs at the intersection of neuroscience research and practical personal effectiveness. The specificity of that intersection is exactly why readers sought it out rather than any of the hundred generic productivity newsletters they could have subscribed to instead.

The test worth running: describe your newsletter in a single sentence that makes a specific person think "that's exactly for me" and makes everyone else think "that's not for me." If your description could attract anyone who reads newsletters, it will attract very few people who actively seek it out.

A more granular check: can you name your first 10 posts without straining? Not titles, just subject matter. If you can list 10 specific things you'd write about, the positioning has enough substance to sustain a writing practice. If you need to think hard, the niche is still too broad or too vague. What to write on Substack covers this problem in more depth, but the heuristic holds: if you can't fill 10 issues without repeating yourself, you haven't found the specific intersection yet.

How Substack's Mechanics Amplify This

Other newsletter platforms are neutral about positioning. Substack is not.

Substack's discovery surfaces (Recommendations, Notes, the Substack Reader) all function through social graph logic. When a writer recommends your newsletter to their readers, they're making an implicit claim: "this is relevant to you." That claim is only credible when your newsletter has a clear enough identity that the recommending writer feels confident making it.

Notes, Substack's short-form feed, works on a similar principle. Posts gain traction when they get reshared within a community of interest. Vague positioning means vague community fit, which means poor Note performance even when the writing is good.

This is why writers who launch with a precisely defined topic tend to compound faster on Substack than on email-first platforms. The platform actively routes readers toward newsletters that can be clearly categorised. That's a structural advantage you either exploit or leave on the table.

What the Setup Actually Involves

Once the positioning decision is made, setup is genuinely quick.

Choose a publication name that either describes what you do or uses your own name. The former helps with discovery; the latter gives you flexibility to evolve. Write an About page that answers three questions: who is this for, what will they get, and why are you the right person to write it. (The About page is the most visited and least maintained page on most Substacks; more on that in how to write a Substack About page.) Write a welcome email that sets the expectation. Publish three posts that demonstrate the promise.

That's the minimum viable Substack. You don't need custom design, a formal content calendar, or a multi-week launch sequence. Dickie Bush, who runs Write of Passage and has helped tens of thousands of writers build online audiences, is consistent on this point: the writers who over-engineer their launch are the same ones still planning six months later. Three solid posts that deliver on a clear promise are worth more than a polished homepage with nothing behind it.

Before You Sign Up: Four Questions

Spend an hour with these before you touch the Substack setup page.

What do you know that's non-obvious? Not expertise in the abstract. The specific thing you understand better than most people in a room. Rachitsky understood product-led growth at a mechanistic level that most PMs never reach. That informational advantage is the foundation of a durable topic-first newsletter.

Who benefits from knowing it? Be specific enough to describe one person. Their job or situation, their problem, the outcome they're trying to reach.

Can you sustain it? The right publishing frequency is the maximum you can maintain without quality declining. A twice-monthly newsletter running for two years beats a weekly one that burns out at four months. Consistency is the one variable most predictive of subscriber retention in the first year.

What's already out there? Before committing to a positioning, understand what's already claimed in your space. Running the Substack Audit tool on two or three newsletters in your intended niche gives you a concrete breakdown of their positioning, content patterns, and strategic gaps, revealing which angles you can step into and which are already well-served. That's 20 minutes of research that saves months of writing into the wrong space.

The Sequence That Works

Lock your positioning. Write the About page. Publish three posts. Then start telling people it exists.

The failure mode is inverting this: announcing a newsletter before knowing what it's for, collecting subscribers around a vague description, then discovering six months in that the topic you actually want to write about is different from what you told them. List-building before product-market fit creates a harder problem than starting from zero.

Substack's infrastructure is excellent and its setup is fast. That's a feature worth appreciating, but it also means the platform removes the wrong bottleneck. The slow part isn't getting online. The slow part is the thinking that should precede it.

Substackr analyses any Substack newsletter and surfaces a full strategic breakdown: positioning, content patterns, audience resonance, and what to do differently. Try it free at substackr.com.