First up Chuck Wendig's awesome and simple guide to writing a book. (Click on the graphic to read more)
Secondly, once you've used Chuck's guide and have a book to pitch, Harlequin editor Emily Rodmell's guide to pitching your novel is super and works with any genre: The Heart of the Matter: How to Find the Essence of Your Plot in Two Sentences.
Thirdly, if you are writing erotic fiction, you can't do better than pick up Ashley Lister's