It may depend on where you are, but I think that all you need is a retail tax number. If you aren't opening a shop in your house, then I don't think you need a business license. Call your local Better Business Bureau, perhaps, and ask. You will have to put profits on your income tax (although there used to be a limit- under $600 wasn't taxed.
at 4:09 PM on Jun. 15, 2009