Always bring the following to every game. Our friend and fellow ref, Paul Lindauer, has a handy mnemonic device: WW, CC, PPP:
WW: Whistle, Watch
CC: Coin, Cards
PPP: Pencil, Paper, Patch. Don’t forget, YOU are the official scorekeeper, so make sure you write down who scored the goals and the final score.
Also, bring flags for the Assistants.