When you install WoW, it install all expansions and patches up to the current client. This is even true if you do not upgrade your account to BC or Wrath. So it will take about 15 gigabytes.
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No, the Burning Crusade is the first expansion to World of Warcraft and does not require any expansions before it. The Burning Crusade is included into the basic WoW now so you do not need to buy that, just the basic WoW.
There is no difference between regular WoW and Lich King monthly fee wise. It is fifteen dollars per month for a subscription, but the expansion itself (along with Burning Crusade) cost 30-40 dollars apiece.
WOW, more fully known as World of Warcraft, characters are many and varied. Images of these interesting WOW characters can be found on websites such as Google Images.
No, but i wish it did.
There are many, one of my fav realms is Funserver.cc