Selling Photos Online?

model 22model 10center 27center 13The reason I  posted these photos that you probably have already seen is because I have a question for you. For any of you photogenic people, I have pondered on the idea of how to sell my photos online.

I know it sounds easy, but how do I do it? Do I set up a page, post photos and sell a print of it by copying it off and mailing it to someone? I have no idea, but I have thought about it as a way to make money. Any help would be appreciated.