Well, I am no expert, but I'll give you my two cents worth. I wouldn't bother with any store from ebay. You will lose your shirt because of all the fees. Not only do you have to pay a monthly fee, you also have to pay listing fees and final value fees. You also have to pay these with a Prostore. The only advantage to using a storefront from ebay is the traffic volume.
Try using an ecommerce host that is cheaper and won't sock you with tons of fees. Look into godaddy.com. I use Citymax.com. They are cheap and have losts of space. The only bad thing is they don't have a search bar.
If you plan to do this as a full time source of income, good luck. A website takes months and months of planning and marketing. My site finally makes money, but it took a couple of years. I hope this helps some.