Fine Art America is the world's most powerful sales and marketing tool for photographers and visual artists.
Simply open an account, upload your images, set your prices for all our available products, and you're instantly in business! FAA provides you with an e-commerce website, fulfills your orders for you, and sends you your profits each month.
there are plenty of threads about it. the most basic of the basic is that you should have things that the common person wouldn't be able to shoot themselves. you need lots and lots of high quality images covering many subjects to peak as many interests as possible. you also have to advertise yourself.