Put 1 defender and 1 attacker in part near goal. Have other attacker at opposite end of the grid. Ball is passed to attacker at end of the grid, who dribbles towards goal end. Defender cannot come out of the defending end. Defender scores if he can kick ball back into no-man's land.
Attackers score by making goal.
Ball which goes over end line is a restart. Play to 5 points, and then switch roles. After playing 2v1 for awhile, you might try 4v2 and watch what happens. Do not interfere or try to teach support decisions. Your team will not work on support roles until much later.