WTF Everyone (Writing Tips for Everyone) Part 1 is a short, but densely packed ebook by Craytus Jones. It's basically a psychological, philosophical and technical discussion about writing and marketing your writing. It has exercises and tips, but also discusses the mindset one must achieve to create and make money on writing. It doesn't tell you how to do it, it helps you do it your way. It's already been helpful to many creatives. Ask somebody who has read it.
This is the PDF file.