In the old days
The best way was to fly WITH a squadron at the times you fly. Make yourself use full, part of the team as it were. Once you get to know the players in the squad, and they you, ask if you can join if you enjoy working/flying with them. If you dont, move on to another squad and do it again.
The best thing about squads is finding guys that like to do the things you do, and play the way you like play.