51 cleric wants to raid, any tips?

[cesrenia]

I have a 51 cleric and I've never participated in a raid before. I want to but I'm not sure if my gear is good enough or what specifically is required of me. My guildies told me to just press complete heal but I want specific advice so I don't screw up. Does anyone have any tips for me because the thought scares me a little. My current mana pool unbuffed is 2335, (I have the epic bought from my guildies) and I have 215 wisdom. I badly need an upgrade for my chest. Looking for any and all raid tips for clerics and any gear upgrades.