That’s a very big answer. To show a sample of your work to people, you need a chapter of the book you haven’t written. To create even one chapter and show it to someone requires writing up a table of contents and a description of what you’ll be saying in your book. Combined with your chapter, that will be a very good thing to show people so you can find out if they like it. I do it all the time, in fact. What I just described is also called a book proposal.
