I'll try to answer best as I can out from my view of wow.
1.
2.
Really depends what you're going to do, if you're going to run instances 1-55 4Shamans is good, speccing one healer perhaps?, go for a simple setup if you're only lvling them to get to 55 for DKs.
3.
See 1.
4.
Again, depends what you're going to do, if you wanna do HCs it would be easier running 3DPS, but imo not as satisfying as taking instances by yourself.
For PvP it's the same.
This is just my view of it, I'm sure others would have a different view on it.
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