Go to fair, a craft show or a farmers market. Set up shop and bring on the buyers. Now is the perfect time of year to do some research on Spring, summer and fall shows. Bigger shows mean higher booth fees, if you're just starting out look into smaller fairs, even most farmers markets set aside a few corners for craft vendors and booth fees are usually very low. Find an open venue, bring a table and your best display ideas and get to know your market. The information you can gather from one of these venues is priceless.
Side note, not every market is great for crafts and not all sellers will have "thier" market at every venue. If you find an open one that will let you set up a table, go with out expectation. You could sell out and you could sell nothing. If you approach it from a market research stand point you'll gain tons, even if you sell very little. Once you've had a taste of the craft world you can research and apply to shows that fit your work. A lot of the fall and holiday shows start taking applications now and its great to go to the larger ones with some idea of what to expect.
You can find some of these big shows hunting for vendors on Craigs List, and you local city art council can also give you lots of good information.