First of all, welcome to the forum...We have a few threads already on this. Here is one of them:
Communications with Coaches
I believe the first and foremost way to deal with coaches is not to wait until something bad happens. Introduce yourself before the game and build a little bit of creditability before the game even starts. Be professional, respectful, and personable. Using proper mechanics goes a long way with building confidence with the coach. There are many examples in that thread that will be very helpful (ie post #8). Once again, welcome
-Josh