I had someone ask if I was selling one of my pictures because they would love to have it. I'm definitely not a photographer, but I did get a really great shot in this one (it's my July 28th pic). I have no idea how to sell a picture though... how do I do it, what format, what's a good price, etc...
when I sold mine recently, I gave the woman that wanted to buy a list of prices based on size of print, type of paper printed on, etc... asked if she wanted it framed or not or mounted or not, let her know what my cost was to have it done and then told her how long it took me to process, etc and told her to add to my cost what she felt was fair and was surprised by how much she added. It was more than I ever would have asked for. Its not the best way to close a sale, but it worked for me.
How do they want it? Framed or not? What size of print? It's variable. So, ask them.
How much do you want to get? What is your time worth to produce this print?
There are a few ways to do it. You can use FineArtAmerica
See my page:
http://fineartamerica.com/profiles/brendan-maunder.html
Or you can get MPix.com to print it and deliver it directly to your client. ie. Drop ship it.