Any attack has to include a pass through one set of gates before a shot can be taken. Ideally, pass comes from middle up through gates for winger to run onto. Winger who receives pass cannot be the one to shoot---that means, they must play in a cross or otherwise pass the ball. That also means that other attackers must get up the field and into the middle to support outside play.  If ball is one back in opponent's half, gates do not need to be used for a shot. 

Other than that, regular rules of 6v6 apply. 

Easier progression: gates may be dribbled through, but gate person still cannot shoot. MUST make a pass from the wing back into the center.