GW:EN is an expansion rather than a standalone campaign, you will need an existing account with one (or more) of the Guild Wars campaigns (Prophecies, Factions, and/or Nightfall) already activated. Eye of the North content has been designed with level 20 characters in mind, however as of December 6th, 2007 characters from level 10 can now also enter and will automatically receive a buff called Journey to the North while in Eye of the North locations to enable them to be treated like level 20 characters.