A very good all-purpose overview of indie authorship is The Indie Author Guide, by April Hamilton. She also has a terrific website (following her own advice!), including a companion site for her book.
You can watch April interviewed by Joanna Penn, where she discusses tips for writers and her own transition from being an indie author to writing about indie authors for Writer’s Digest books:
[youtube=http://www.youtube.com/watch?v=ui27oovx8yg]