Buying WoW- HELP!

Hello memebers of the WoW Wiki, I just began playing WoW`s free trial, and so far Im loving it. Im gonna get it for christmas but not sure how it works. I didnt want to upgrade my account through the trial, I wanted to buy the CD. I wanted to buy WotLK, but what do I do? Do I buy only WotLK and istall it? Or do I require to buy the original WoW and THEN WotLK? I`d love it if you guys could solve this riddle for me. Btw, to be a human DK, for example, can I make a Draenei go to lvl 55, or does it have to be a human? Thanks

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