Here are some materials that will help you at all stages of your teaching career.
General resources:
OSU Physics TA handbook (PDF): Contains information specific to teaching in the OSU Physics Department and some general discussion, too. You will receive a copy of this in your orientation packet.
U. Minn. TA program: A well-developed and comprehensive TA training program.
Oregon AAPT: The Oregon chapter of the American Association of Physics Teachers offers opportunities to meet with other physics teachers and share information about the art and science of teaching physics.
Mazur, Harvard: Peer Instruction information, as well as a number of other education topics, by Eric Mazur, a pioneer of the "peer instruction" method.