Go to the UVA Teaching Resource Center.

Yes, it's that simple. I can't say enough to recommend them. Many online resources, a searchable library, workshops, and individual consultations. A godsend for anyone who wants to improve their teaching.

If you are ready to step it up a notch, apply to join their professional development program for graduate students: Tomorrow's Professor Today (available in a one or two-year version).

When it comes to preparing course materials, don't reinvent the wheel! Look for good templates and use liberally. See samples of syllabi, grading rubrics, etc. here, and also take advantage of online course management tools to look up syllabi from past semesters.

One more good online resource: For a first-class collection of teaching tips, and thoughtful reflective essays on the process and principles of teaching, see Joe Hoyle's website. Hoyle is the David Meade White Distinguished Teaching Fellow at the University of Richmond, where he is Associate Professor of Accounting. If he can make introductory accounting classes engaging and memorable, surely we can all learn from him. His book -- Tips and Thoughts On Improving The Teaching Process In College: A Personal Diary -- is available free of charge for download.