Here are a few books that might help you on your journey as an writer:
How to Write a Book Proposal
by Michael Larsen
Write the Perfect Book Proposal: 10 That Sold and Why
by Jeff Herman and Deborah Levine Herman
Writing the Breakout Novel
by Donald Maass
Buzz Your Book (PDF Download)
by M.J. Rose and Douglas Clegg
Save the Cat! The Last Book on Screenwriting You'll Ever Need
by Blake Snyder