A web search on "Crafting Business Guide" returns over 26 million hits but a little research shows that most of them, in one way or another, want to sell you something. I think I'd start attending craft fairs and asking lots of questions. Learn from doers, not from writers.
Here are a couple of guides: The Crafts Business Answer Book & Resource Guide: Answers to Hundreds of Troublesome Questions About Starting, Marketing, and Managing a Homebased Business and Craftlink Business Resource Guide.