In order to play World of Warcraft, you need the following:
Blizzard World of Warcraft + Blizzard World of Warcraft: The Burning Crusade Expansion
OR
Blizzard World οf Warcraft Battlechest
When you reach level 70, you need the following Blizzard World of Warcraft: Wrath of the Lich King
In some days, cataclysm releases, so you will need the following Blizzard World of Warcraft : Cataclysm
With the battlechest or the first 2 cds , you can create an account with 1 month of free playing.
When this month ends, you will need the following Game Card ( 60 days ) in order to continue playing.
Ready!
PS: The links are from a shop in Greece, you know.
PS2: If you really want to start, i can send you an invite to start playing. You will level up a lot faster.