The best cleric tip I can give is that if your group is going up against a lot of caster mobs, you might want to help out on the stuns a little. You can save your group a lot of mana that way and if your DPS is good enough the mobs shouldn't last long enough through stun to do any damage to you (because you will probably pull aggro). If you have an enchanter you can even chain stun mobs instead of healing, it depends on what level you are and where you are relative to what level the mobs are, but I always have a stun or two on my bars no matter where I am.
I also always have gate on my bar.
In groups, people really like it when you announce who you're healing, I do not personally have announcement macros set up, but I know that it makes people feel better. If you have a second healer in your group though it is very nice so that they do not over-heal the person you're healing.
Other than that, sit back and have fun, it's a lot less stressful than pulling or ccing or tanking, just try not to let people die.
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