You have to find an addon first that is supported by cataclysm. Then once you have one you put it in the "Interface" folder in the World of Warcraft folder. There will be a folder in Interface called "addons" thats where you put the addons. then before selecting your character when you are almost in game you need to click on manage addons in the bottom left corner and make sure they will be on.
one good place to check out for addons is the curse addon site listed below.
Depends on what kind of addons they are. You don't need Cataclysm for alot of them, though.
Some of the more popular addons are:Boss Encounter ModsDeadly Boss ModsBigwigsBag ModsArkInventoryBagnonOneBagAuction ModsAuctioneerAuctionlite
Considering WoTLK is 18 GB Normal, i'd keep atleast 25 - 30 gb for catacylsm inclusive of addons
Wow interface is good for beginner and curse is the website you use to find addons
Cataclysm Patch.
Yes, you can use any addons that a full account can use. There is no limit.
November 7 2010.
No, as Cataclysm is meant for World of Warcraft, not Warcraft 3.
really wow get BC and WTLK then buy cata then install
December 7th, 2010.
yes,how did u not know that -.-
Download a wow addon manager like wowmatrix. Google Wowmatrix --- Inside your World of Warcraft game folder you will find a folder called "Interface". Inside is a folder called "Addons". Addons provided on abovementioned websites usually come zipped, with the files in a folder with the addon's name. Simply copy this folder entirely into the "Addons" folder. Make sure to quit WoW and restart it. At your character selection screen, at the bottom right, is a button "Addons". Click it to see a list of addons you are using. Make sure all addons you want to use have a tick in the box, and that the box "Load out of Date Addons" is ticked, in case you installed an older addon. Log into your character, and the addon should now be active.