If you post your reform card, I promise you a free review and pointers on exactly how to avoid getting banned in the future.
However, going on the odds, I'm going to give you this advice:
1. Never talk bad about your team. Even if they "deserve it".
2. Never say "I quit", "surrender" or "report". If you are going to do any of these things, just do them and be done with it. Do not make a production out of it.
3. In addition to obvious racial or derogatory terms, do not say the following words or variations upon them "r--ape", "gay", or "reta-ard".
4. If you find someone annoying or irritating do not respond to them or talk about them in any way.
I wish you luck in the future.