Buy this book. Read it. Implement it.
http://nathanbarry.com/authority/
Doing those three things have directly led to me earning approximately $40,000 from book sales in the last 16 months from my book Mastering Modern Payments[1], and I'm not even Nathan's best case[2].
Writing and editing and publishing and promoting a book, even a short one, is a difficult thing. It's one of the hardest things I've ever willingly done. That said, it's been one of the most rewarding projects I've ever undertaken, both financially and for consulting and contracting prospects.