After customizing character in the beginning when heading to the tower you are prompted with a class selection message that can benefit you in being a Warrior, Mage, or Thief. You also have a choice just to continue the game without class selection.
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At the start of the game after you customize your character and you head to the first tower you normally go to, you get prompted to choose a class or start your game normally and whatever class you choose if you so desire you are prompted with another message asking you what starter kit of the class you want to choose.