World of Warcraft trial help?

[:1]I have the trial and i plan on upgrading to full game soon, it was the cata trail, 9gb up to the patch 4.1. I want to know when i upgrade the game and spend the 100$ for all the auth keys, is the 9gb cata trail the full game with all the expansions or do i have to download lich original wow and burring crusade, and when i open it it wont say cata trail anymore?|||I'm fairly sure that you have all you need now - the account just needs upgrading, not the software.