TAs Be organized and prepared. Make sure at the beginning of each class that students know your plan and goals for the session. Refer to it periodically and conclude with it at the end of the session. Begin and end the class on schedule.
Students are extremely time conscious, especially when distance is a factor between buildings.
Be careful about copyright laws in regard to the use of articles and videotapes. Academic freedom is not academic license. Do not use classes as political forums for research specialties. Check occasionally with people in the back row to see if they are hearing your words and seeing your visualize adequately. Let humor arise from the interaction of the class.