Kathleen,
You're kidding right? You've been here ALMOST a full day and no sales? That's not how it works here and you should know that. There are no guarantees that anything will sell here. It may takes monts and many more images before you see any sales,if at all.
I think you have a good eye for composition, but you need many,many more images for this to work. Look around and do some research and see who is you competition and see how you stand up to them. Then make the decision if you want to get into this and join($30),still no guarantees, and see how you do. This "business" is not for everyone,really not for most,
Rich