Welcome to your command center, champion
Follow these steps to start playing
Download a World of Warcraft Wrath of the Lich King (3.3.5a) client. You can get one from Warmane's download page or any other source for a 3.3.5a client.
Open the following file in your WoW installation folder:
Data/enUS/realmlist.wtf
Replace the contents with:
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Launch WoW and log in with the same username and password you created here. See you in Azeroth!