House Painting Business

I am searching for a good reference, or "how-to" guide on how to start a painting business. Has anyone here been in such a business, or know where I can find good info? I need to know how to estimate how much paint needs to be used for a job, plus how to charge, among other details. I can do a Google search as well as the next guy. If you mention a particular web site, or book I hope you have some experience with it, or know someone who has.

Ned