Here are the top 5 addons I'm using. What are yours?
Just about the best addon to have starting at at level one.
Your personal navigation assistant in WOW
Bag space is limited, money is tight, sell that junk every chance you get.
4. Elkano's BuffBars
It's good to know the name of all this buffs & debuffs your getting.
5. Guild Roster Manager
This guild is large and soon to be huge, this helps manage it. Still in the setup phase. Provides lots of info at any guild rank.
Others include Deadly Boss Mods (DBM), Bagnon, Bartender4
** Some of these links might point to the Retail (WOW 8.2) Version. be sure to verify that your getting the version compatible with Classic.