During an raid or instance run by te guild the following rules will apply.
1) Even if you do no have a microphone you must have voice chat enabled so that you can hear the instructions from the raid / instance leader.
2) One or more persons will be made Master Looter, no one else will loot. If you are caught looting, you will be booted from the raid or group.
Those are my only 2 major rules, they will help make sure loot is divided fairly, that the run goes smoothly and that everyone has fun and gets what they need done.