Here are some resources to help you get started in preparing your teaching philosophy statement.
Teaching Philosophy Template http://www1.umn.edu/ohr/prod/groups/ohr/@pub/@ohr/documents/asset/ohr_78221.pdf
University of Minnesota Self-Paced Tutorial for Writing Your Teaching Philosophy http://www1.umn.edu/ohr/teachlearn/tutorials/philosophy/start/prompts/index.html