I got a business license for a home business for internet sales but under my business name PatrickKnives. I am not sure I could get one for knifemaking in my neighborhood. There are several business that operate out of the gargage near me. They dont seem to mind as long as I send the annual check. I also have a California Resale certificate, knife shows in CA require a resale certificate to get a table, it also makes you business legitimate for tax reasons. You also need the business certificate to get into the yellow pages.
One last thing, open a checking account and get a bank card with you business name. It will make tax time easy... I am suprized how many people try to run a business out of their personal accounts. I keep all my expence reciepts and record them monthly in a ledger.