A lot is going to depend on where you live. Here in Rochester, land of Kodak, everyone seems to think it's as easy as pushing a button, and letting Kodak do the rest. Or whatever their ad campaign is now. Trying to sell photographic art here can be a pain, and tends to fetch a lower price than some other nearby cities. I'm also guessing that the art market in San Fran is going to be different than small-town Kansas. Take a look at what other photographers are selling their work for to get a good idea. If anything, start lower (but high enough to make a profit) and then raise your prices if you guessed wrong. Lowering your prices is not a good idea.
Get your work into some art shows. Many galleries will have group shows that you can enter for a small fee. They will usually take a comission from any sales made, but it will give you exposure.
Networking can be really important. I've never done art fairs, but I've make sales to collectors through galleries. Go to a lot of shows and talk to the photographers and gallery owners. Take some local classes. The more connections you make, the easier it is to find opportunities.