Hi! My best experience with something like that is a site called etsy (www.etsy.com) It's very easy to use with a simple photo uploader (so you can just add them from your computer to your listing, no separate photo hosting site required), the listing fee is VERY low (twenty cents per item) and they stay up for 4 months.

Ebay, of course, is always an option. Hands down, it gets the most traffic, but embroidery work does not always sell well there and the fees are higher.

Overall, my experience has been that vintage embroidery is harder to sell. More people are interested in printed pieces. It can be done; it's just the turn-around is longer.