Doing a Dungeon is a lot easyer if everyone is folowing the same rules.
*Drop Rules - raid leader must make it clear before getting in to a Instance.
*Charaters Function - raid leader must define each function for each player before joining the instance. This is crucial becouse there are hibrid classes, has Druids, Paladins and Shamans.Hibrid classes have many diferent skills depending in theyr talent points and gear. The same happens whit classes who have a main function.For example, a shadow priest, he is Dps, he may prefer to play has a Dps instead of healing.
*Loot- its better to wait before every mob is killed. Many players think that looting in a middle of a fighting may distract them.
*Stay whit the group- if you walk alone, you may find mobs and get yourself killed or starting a usseless fight...
*Tank goes ahead- in a instance, let the tank go ahead. That way,if the group finds enemyes, the better geared player to survive the attack is ahead.
*Caster- give some time to casters to restore mana before starting another fight.
*Ninja Loot- dont ninja loot. If you dont need a item or is not for your class, just dont try or loot it, that is ninja loot, and people will not invite you again for a raid.
*Logging out in a middle of a instance- dont get afk (Away From Keyboard). If you need, tell the group you need to logout.