Clerics are easy to play so you don't have to worry too much. You're either the party buffer/healer or you're a self-buffer that thrives on touch-death/massive injury spells. I recommend the second one, tbh.
Decided on Cleric! rofl, sorry. I've never played a cleric before, though.
If you're going to be human, I recommend starting as a fighter and gain at least a few levels in this class, then dual class to cleric. You will then be a cleric with many of the abilities of a fighter.
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Can't provide such advice in a vacuum, you know. Not effectively at least.