Do I Need A Business License to Sell My Jewelry?

by Rups.
(San Francisco, California USA)

Hello:
My name is Rups and a novice in jewelry making.

I visited one small animal museum today and I asked that lady whether I can display and sell my handmade jewelry in that museum.

The museum lady said that they are always looking for local artist and I can talk to her manager who will be available next week.

Meantime I want to know the following:

1) Do I need to have a business name and license to put my jewelry there? Or in the beginning it is okay to do without it?

2) How many jewelry I should give initially?

Thank you so much.

Rups