After the classic World of Warcraft game comes The Burning Crusade expansion. The current expansion is Wrath of the Lich King. The next expansion is Cataclysm and will be in stores December 7th
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While you CAN play World of Warcraft with out either of the current expansion packs, you will not have access to levels 61-80, wont be able to use the professions past a certain point, and will not be able to visit Outlands or Northrend. It would be better to just go a head and purchase the expansions now so you have access to all WoW has to offer.
There shouldn't be a specific order, as long as you have the Sims 3 base game downloaded first then the expansion packs and stuff packs should be ok to download in any order.
expansion pack expands the game. stuff packs give you items
Expansions: World Adventures Ambitions Stuff Packs: High-End Loft Stuff
Yes you have to have the actual game for the expansion packs to work.