Selling a poster?

[MOO]

I have had a very favorable response to my treehouse painting on facebook and we have a Wild Bird Store down the road that I thought might like to sell posters of it. I was thinking of getting it professionally scanned and print a few to take over and show them. I'm a bit nervous about it and I don't know how much to sell them for, etc. Does anyone have experience with this? I need to be confident and promote it well...that's my biggest hurdle I guess I can look up how much they sell for online....anyway, any thoughts on this are appreciated.