You might check out Etsy. It's for handmade items. Just make sure that your items are either your own creation or that it's not against copyright to sell things made from the patterns. Unfortunately it often is.
A friend of mine sells some of her things (like the cutest baby hats ever!) in a baby boutique by consignment. Try some local shops and see if they could use some knitted specialty items. Having them in more upscale shops means more money- it's often hard to sell handcrafts for much more than the yarn cost.
Good luck with your new venture!
OTN: - Tree of Life afghan, socks, afghan for Dad, Tura Maeve baby dress, alpaca Winter Mountains scarf, Frida poncho