Actually, what are you planning to do? You said you want to open a hardware store, but lack money. So, you want to earn money from eBay first, am I right? If the case is like this, I think you will spend a lot of time to achieve your goal. Think about if you can earn so much money on eBay in short time, why you still need to open a store? If I were you, I would gain more experiences on hardware store first, to know more how the business run. In the same time, save money and seek for some partners. Money, of course, is the big factor. But don't forget experience! You are running a business, not playing a TV game. So, put more time on your future store, not in eBay.