E-commerce Back End

I need someone to design the back-end of an e-commerce site selling printed photograps. What I would need is basically a finished site but with the design which I would be able to modify. Here is what my client wants: -"Yes, we already do our photo editing, croping, etc. We use Image Pro." (They want to be able to maintain the site themselves, i.e. upload photograps and thumbnails) -"When you have the opportunity, look at Wildcat Studios' website. It's a little more diverse, but similar to what we have been thinking about. We won't have all the differenct types of photo venues that they do, just our sport photos." ([login to view URL] - I don't think this complications like choosing the number of thumbnails per page would be necessary) -"I would like to have a watermark on each photo as each photo is copywritten, let the customer be able to see the photo they will order, yet be secure so a customer can't download an image nor print it. That's a big concern. We need to protect what's being seen. " (I don't know about this, perhaps the photo preview might be a CSS background with a .gif or .png watermark in the foreground) -"We believe we can maintain the adding and removing photos from the site ourselves. So, initially, we wouldn't need assistance there other than to get us started on how to do it." (my concern would be the search function that exists in the site my client refered to, I guess that would require some automatization, because the client wants to maintain the site by herself)