The official rules for games are in the IQA Rulebook (I didn't write it, and the rules are actually used in real matches).
Team requirements:
- Different colored shirts or jerseys
- Brooms
- Food
- At least two girls and two boys on each team
- 7 players on each team
Fouls:
- Tripping
- Kicking
- Punching
- Tackling someone without the quaffle
Game requirements:
- Quaffle (volleyball)
- 3 bludgers (dodgeballs)
- Snitch (person wearing a yellow jersey that you tag)
- Color coded headbands
- Referee
- Scorekeeper
- Timer
- Yellow and red penalty cards
- Substitute players