Hi damzookeeper ,
Yes it is free and anyone can make there own store.
Just go to http://www.cafepress.com/cp/info/
and just click on there "learn more and start selling" button for all
the info. Cafepress has a set price for there product so if you want to make any money from there stuff you just add what you want to make to the selling price.
Then if I remember right when people do buy anything from your store they just send you a check in the mail every month. By the way I have never gotten a check from them. I guess buying your own product dose not count. LOL