What should include in a college letter?

OK. so i am sending a letter to my future college, but i am only in middle school. I am sending a letter to Los Angeles Film School saying that i want to go there. My sister wrote a letter to her future college and she got a letter from them and a brochure and newspaper. I want to get that ,too. What should i put in the packet? Since I am going for Compute Animation should i put drawings or what? and what do i include in the letter. Thanks for your help!