There are many different genres available in both fiction and non-fiction so before you start your book, have a plan of what it will be about and the genre it will fill. You will need to have a specific genre when you are writing a book so that you will be able to market it properly. Some books will cross genre lines - such as paranormal and romance and some books will fit neatly into a specific genre. It should be clear to the reader what the book is about so that they will be interested in what you have written enough to buy the book. Most readers have types of books that they like to read and tend to stick with one or two genres. If you are writing a non-fiction book, you need to make your book stand out among the rest in a way that will set it apart from other books of the same genre. If you are writing an Italian Cookbook, for example, how do you make it stand out from the other Italian cookbooks that are on the market already?
Once you find your genre and know what you are writing about, you should start to think of marketing your book. You will need to do this in such a way that it will be set apart from other books of its kind and entice readers to buy it. After you have figured out what you are going to write about and what will make your book stand out among others, you can then start to outline your book by writing down a synopsis of it and the point that you are trying to make. Good books carry a message; make sure that your book has a message to the readers that they can take with them at the end.