CIDR stands for Center for Instructional Development and Research, and they are there to help you in any way that relates to classroom teaching. They have consultants that will work with you if you feel that you have problems in leading your quiz sections efficiently. Their help can consist of a consultant sitting in on your quiz section, or a full-blown videotaping of it, for later review and discussion. They also have special programs for international TAs.
Some students from our department have participated in microteaching sessions in the past, and found it very helpful. You might want to try it. In a microteaching session, you teach other participants a short lesson while being videotaped. Afterwards, all participants review the videotape with a CIDR consultant, set goals for improvement, then reteach the lesson while being re-taped. The tape is then reevaluated.
Check out CIDR's web page: http://weber.u.washington.edu/cidrweb/cidr.html.