Undergraduate / I want to write an essay for the art institute in Chicago and I really need help [4]

I've just started to get down to filling out application forms and I kind of got stuck on the essay for the art institute. I really like this school and I would really like to get in. I have a dream of becoming a successful animation artist working in a place like Pixar or a game company like midway or Bandai and really enjoying my job. I'm really good at drawing and copying anything my eyes see unto paper and I think that this is my calling, I just don't know how to start the essay.

Help?