I ran an eBay store in college. It sucked. Too much competition. Margins were too low and drained my time. There is even more competition now. Unless you have specific niche with very little competition, it will be extremely had to make decent money on eBay without a full team to crank out volume or selling very high end items. Most people lose money on eBay stores after paying the monthly and listing fees.

I'd agree with Acstudio, save the money. Staying out of debt slavery and being prepared in case of emergency is far more important than gambling a couple hundred bucks on an investment. Once you have a solid Pharmacy job and/or learn enough to be consistently profitable in the markets; then you can start into that process.