Yep, what Carleton said.
And, congratulations on your interest in track biking. First step, find out the local velodrome schedule and go check it out. Typically they have loaner/rental bikes where you can get a feel for the track and what you might want in a track bike. Definately get some time on the track before buying a bike, if you are serious about the track.
If you are looking for a hybrid track/road bike (typically a steel bike), you can pretty easily swap out handlebars. Don't have to worry about brake cables and the like on a track bike.