you gotta check in your area.. you don't really need to try out for a team unless it's an elite team. Check in your area for some of the aau teams and you can sign up with one.
the cost depends on what team you join and what tournaments they're going to.
Check out one of the top point guards from Northern California 5'7" Kiwi Gardner of the Oakland Soldiers showing out this summer at the Las Vegas Fab 48 and Nike EYBL events.