There are no addons that you could say are required. A lot of them are just incredibly useful tools. A good site to browse addons and see if there's anything you'd like is Curse. You can also have a look at WowAce, although that's more of a listing and doesn't really provide much information on the addons. They do have a nifty little program that will search for what Ace2 addons you have installed, and update them all when you run it.
I think I picked up a lot of my addons just from watching videos and seeing peoples screenshots, and getting the names of the addons.
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