What do I need to start an online clothing store?

Question

I am interested in starting a plus-sized clothing store. I don’t have much starting money, so I’ve decided to go the online route in selling my products. I plan to design and make my own clothes, and before I even create my own website I plan to sell them on eBay, mostly to test the waters and see if anyone would buy them at all (plus this would give me the opportunity to decide on how much to sell them at and how I would pimp/market/describe them).

I know what I would need to make them, such as a sewing machine, cutting machine, and a press. I also have an idea of what type of fabric I would be working with and who I would be buying from. I plan to use paypal to process money coming in and use UPS for shipping.

I also know that with a physical store I would need a vendor's license and a number of other documents, but what sort of documentation would I need, if any, for a virtual store? If anyone has tips or pointers or to share, please pass it along and thanks in advance.