Honestly.. I would advise 2 gigs. Though my laptop isn't the best in the world and has 1 gig and runs fine on it. So at the bare minimum with minimum graphics you can go 1 gig RAM and still run about 21-25 FPS. (no graphic lag)
Depends on what kind of addons they are. You don't need Cataclysm for alot of them, though.
First and foremost, to become a Worgen, you need to have an account that is paid up to Cataclysm. If you did not purchase the Cataclysm expansion, then you can not be a Worgen.
ANSWER::: cataclysm costs $39.99 @walmart in the us.
Yes, to play Cataclysm you must have WotLK, like to play WotLK you need TBC.
Yes you do
Yes.
To run windows 7 you need at least 4gb of ram
It is the expansion pack that comes after Wrath of the Lich King. You do not need to purchase the CD/DVD to play as you can download the client which allows you to play as you are downloading (once you download enough of it). Although you do not need a Cataclysm account to play the basic WoW, you do need it to take full advantage of all the Cataclysm features, zones, and races.
about 3gb of ram is recommended for windows 7 starter.
15$ a month
no
For a gaming computer you will need at least 4GB of RAM. Most people average 6GB for their gaming computers.