Read, read, read. And learn about how publishing works in your field before you start writing. Publishers almost always want to work with an author if the book is nonfiction but many authors have their book finished before approaching a publisher. It is important not to let the book get in the way of your writing. In my acknowledgements in Amen, I noted that my husband, Scott, makes me an author. I'm just a writer; he helps me organize my written pieces into a coherent whole. If I had to do write to an outline, I'd be stopped dead in my tracks. Never let the book get in the way of writing it.