What are the roles?
Each of the roles, "Rifler, AWP, Support, Lurker and Entry", are all roles that people play as when you are on a team. Usually. you put your player who prefers to use rifles as a rifler and your player who prefers to use sniper rifles as your AWPer. You don't need to fill all these roles to in order to join the league, but they are helpful for team organization while playing.