Publishing on Amazon KDP costs nothing upfront. That is the good news. The hard part is everything around it: the book type, the niche, the trim size, the margins, the bleed, the keywords, the categories, the rules. Get one of them wrong and Amazon rejects your file — or worse, accepts it and your book looks amateur next to the ones around it.
Here is the process, in the order that saves you the most rework.
Pick your book type first
KDP is not one kind of book. Coloring books, puzzle books, journals, planners, romance novellas, and cookbooks are all KDP books, and they are built completely differently. A coloring book needs single-sided pages and thick lines. A journal needs dated or undated layouts and the right paper. A romance novella lives or dies on its blurb.
Pick the type before you write a word, because the type decides the specs, the interior, and the cover. If you're torn between two types, pick the one you can finish. A finished journal beats an unfinished novel every time.
Check the niche before you build
Search Amazon for your idea and look at what's already there. If the top results have hundreds of reviews and professional covers, that niche is crowded — you can still enter it, but you'll need a sharper angle. If the top results look rough, that's an opening: readers are buying, and nobody has served them well yet.
Look for the gaps. A cookbook for one specific diet. A journal for one specific reader. A puzzle book in a theme nobody has covered. Small, specific niches are where new authors win.
Get the specs right
This is where most first books fail. Every KDP book needs a trim size, margins, bleed, gutter, and the right DPI — and the numbers change with your page count and book type. A 100-page journal and a 200-page cookbook do not use the same gutter. A coloring book needs bleed; a novel usually doesn't.
Use KDP's own published rates to check your print cost and royalty before you commit to a price. A $9.99 book and an $8.99 book can earn you very different amounts, and the royalty tier changes at certain price points. Do the math while you can still change the price.
Keywords, categories, and the description
Amazon gives you seven keyword slots and two categories. Use them like a reader would. Think about what your reader types into the search bar, not what you would type. "Keto recipes for women over 50" is a keyword phrase. "Keto" is not.
Your description is your sales page. The first two lines matter most, because that's what shows before the "read more" cut. Say who the book is for and what it does for them, in plain language, and keep the whole thing under Amazon's character limit.
Run the publish checklist
Before you hit publish, walk the checklist: interior file correct, cover the right size with spine math done, AI-generated content disclosed if you used it, categories and keywords set, price checked, preview reviewed page by page in KDP's own previewer. Then publish, and check the live listing the next day like a buyer would.
That is the full process I built into KDP Book Builder: pick your book type, check the niche, get the exact specs with print-cost and royalty math, build the content with 15 prompt builders, and finish with KDP rules checklists and a publish plan. It covers coloring, puzzle, journal/planner, romance, and cookbook. The tool plans the book and builds the prompts — it doesn't publish to Amazon by itself, and it won't guarantee sales. But it will get you to publish-ready without the guesswork. It's $21, a one-time purchase: KDP Book Builder on Gumroad — https://madisongroup.gumroad.com/l/sxsbt
Your idea is already a book. Now make it publish-ready.
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