Simply search "World of Warcraft client" in any search engine such as Google and you should find it in the top five results.
You install a CD and use the internet to play you can not play on the website.
No, you can use the same CD and install it on other machines BUT you can only play one machine at a time. Since it registered to your account.
To play as a Draenei in World of Warcraft you need to purchase and install the Burning Crusades expansion pack. Then create a new charactor and pick Draenei.
No
You'll need to install a language pack for that (official link included)
A better question is "who doesn't play world of warcraft?" between 9,000,000 and 10,000,000 people play world of warcraft
Start to play runescape. you will get bored and not want to play world of warcraft.
World of Warcraft
If you have your own computer with you, World of Warcraft installed on it and access to a stable internet connection, there shouldn't be a problem. If you're using one of the school's computers you can install the game on a portable harddisk and play it from there.
If you do not have the install disc for World of Warcraft, then yes, you have to download it and let it update to the current version.
you buy the expansion set and install it.
You just need to install the original World World of Warcraft. Then you can buy the expansions later, if need be.