John Locke can tell you how he sold a million ebooks. I'd like to help you be happy with whatever writing success you have. The Indie Journey: Secrets to Writing Success, has some philosophy, business, product development, publishing, and marketing tips to help keep you sane when everyone else is trying to win the lottery. Bonus stuff from Vincent Zandri, cover designer Lon Shapiro, JA Konrath, Zoe Winter, Vicki Tyley, and Guido Henkel.
Also, the Write Good or Die manual is still available for free: