First things first don't worry about raids. If you want to raid and have the time and know your class you should be fine getting into any guild. Now what do you want to do?
Bards are jack of all trades master of none. In a group as a bard you will be pulling, CC, singing buffs, and meleeing all at the same time.
Enchanter you will be buffing, CC, charming for dps, and lulling for pulls.
Charm lasts as long as it lasts. You could tash and malo a mob and charm could break or it could last full duration. You have to pay attention anytime you have a pet charmed.
Shaman you will be buffing, slowing, healing, and casting canni the whole time.
Necro if you get a group you will be dpsing and spot healing.
But none of this matters if you don't like the role you do in a group. As for raiding don't worry about it till you get 55+.
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