There is a thread running in this forum (General Discussion) titled "My New Gallery" and some discussion is taking place on which internet sites can be used to sell images on.
Sorry can't help you more than that as I don't have any experience of the subject.
Hope that helps.
If you want to edit any of my images to demonstrate points/techniques to either myself or others please feel free to do so.
Still learning with Canon 40D, 28-135mm, 100-400mm L and Elements 6.
Any Advice greatfully received.