Watch the Repertoire online guitar lesson by Ben Wright from Bluegrass Banjo for Guitar Players
Having a list of tunes you know is key to being comfortable in jamming situations. The sooner you can get out and jam with people, the quicker you're going to learn how to play the banjo. Go online and find the tunes below and listen to them before you work through them with the play-alongs. If you're familiar with the song before you start to play it, playing along with it will come quicker and easier.