Choose the reader before the chapter titles
A collection of notes often contains several possible books. Start by identifying one primary reader and the problem, experience or question you want the book to address. A clear reader gives you a reason to include one idea and leave another for later.
Sort by purpose, not by the date you wrote it
Group your notes into questions, examples, practical advice and personal experiences. Look for material that repeats the same point. Keep the strongest version and preserve distinctive examples rather than carrying every repetition into the draft.
Build a route through the material
An outline should help the reader move. A practical nonfiction book might begin with understanding a problem, then choosing an approach, then applying it. A memoir may follow a different shape. Choose the sequence that serves this particular book rather than forcing it into a borrowed formula.
Draft one representative chapter
Before developing the entire manuscript, write a chapter that demonstrates the intended voice, depth and structure. Use it to decide how much explanation, story and practical application the book needs. This is also a useful stage for agreeing on direction with a ghostwriter.
Keep a place for material you remove
Create a separate document for promising ideas that do not fit. Removing a note from the current book does not make it worthless. It may become an article, a resource or part of a future project. The aim is a coherent book, not a complete archive of everything you have thought.