Hi Twyla,
When I looked at your profile, I saw that you have not uploaded any of your artwork images. Try uploading an image, even if it's not your best one -- just to experiment with what you can do. Once you have an image uploaded, you can click on "Behind the Scenes." You have to be logged in to do all this. The part of Behind The Scenes where you price your work shows you how much FAA takes (it's a fixed amount for each item) and then allows you to decide what your mark-up will be.
Try it and if you still have questions, you can always come back to this thread and ask more questions.