T-shirt website

[Vince.]

I'm pretty decent with Photoshop and was wondering what it takes to create a website where I can sell t-shirts with my designs printed on them. I don't want to have to physically deal with the t-shirts myself, but I've heard of sites like cafepress where you don't have to physically print the designs on the shirts yourself. I have no idea how these sites work though. What is the cost to set up a store on a website such as cafepress and sell shirts with your designs on them to people? I don't want this to be a serious income for myself, just a little hobby where I could possibly make some extra money. Sorry if this is all really basic stuff, but I have no experience with this and was hoping someone who knows more about it could help. Thanks in advance.