You can be a producer yourself if you can with your own book. It is odd or luck to get your book into a movie not unless it is known to every part of the world. so, when it becomes a movie, everyone will become interested. You can hire a company or someone else to do a movie for you or sell your book first to any producers or directors, they might have an interest to make your book into a movie once they read it. You might need to include a script about the book so they have an idea about what's its look like to be. It is very rare I think to make a movie from a book. It would be nice if it base to a true story, then the story its lef is interesting to anyone. Better story, better book,good script and best movie,it might be in the end. Try to approach form movie industry about your book.