One thing I would say if you move forward with your idea is this: get away from ebay! Their fees will kill your profits. Web sites and your own domain name are so inexpensive these days, you can't imagine how much you'll save in ebay fees.

With almost any Linux server you'll get free ecommerce applications that you can install on your website and use for your selling. Many offer more than one so you can install them all and try them out to see which one you like.

Good luck to you!!