Unlocking and Creating the Death Knight
Simply have a character of at least level 55 on the World of Warcraft account you play, and you will be able to create a new level-55 death knight of any race (if on a PvP realm, the death knight must be the same faction as your existing character). Upon entering the world, your neophyte death knight will undertake a series of quests designed to teach you your new abilities. You will be able to create one death knight per realm, per account.
i copy pasted that from worldofwarcraft.com so thats the actual one
Simply have a character of at least level 55 on the World of Warcraft account you play, and you will be able to create a new level-55 death knight of any race (if on a PvP realm, the death knight must be the same faction as your existing character). Upon entering the world, your neophyte death knight will undertake a series of quests designed to teach you your new abilities. You will be able to create one death knight per realm, per account.
i copy pasted that from worldofwarcraft.com so thats the actual one