I have a game tomorrow morning and it's going too be very cold. I need ways too stay warm and especially keep my hands warm as I am one of the teams play makers.

just by playing the game if you a key player like you say you are then I don't see many situations where you will be standing still so the running alone from playing should keep you warm enough

Wear gloves put your heat base layer on(or a warm T-shirt) and keep warm (on-off the pitch) by jogging on the spot. Put some gloves on. Preferably rugby gloves because they have grip so you can hold the ball still Just try to keep your mind off the cold,sounds weird but really helps:) Good luck with your game aswell

Wear gloves and run more