Nota bene: turn on your pop-up blocker before visiting any of these links!
I was just puttering through my preparations for the local juried Fine Craft and Design Fair and decided to peruse the ‘net and see what new has been written. About.com has come out with a marvelous set of articles about starting and maintaining a craft business. They cover such things as:

• stuff to do when starting out
• common mistakes
• things you should think about before you spend any money starting out
• pricing your work
• promoting your work
• basic business planning
• basic info about craft shows
• how much inventory to bring to a show
• some basic show “rules”

That’s only a short list; there are many more such pages. They won’t tell you everything you need to know, but they’re a great starting point and a wonderful refresher for those of us who need one.