It's not too difficult.
After the rules are made.. follow said rules.
Bring up suggestions about the rules if you don't agree with them. Don't just be like "i don't like it", try and find a reasonable solution.. or admit that you don't know how to fix it, but encourage others to pool together to work on an appropriate solution.
Remain open-minded. There are always more views to everything besides yours.
Be fair in your bans. If you would ban your enemy for two weeks, ban your friend for two weeks for the same offense.
various other things..