Merchandising

I want to start a clothing line. I think it would be fun to sell, just for some extra spending money. You know, one of those trendy, punk t-shirt companies that have random words spray painted across the front or back with some stupid kind of clipart everyone loves. I think I have a good name and a pretty "trendy" idea. But, I need to design the shirts - which wouldn't be hard. I was checking out Shirtcity.com and they have a free shop I can set up. It might be worth it. All I'd have to do is design and pay for product. That means start-up costs are almost absent. I think I only pay for product if someone actually orders.