Have a look at the Victorian Karting Association
Web site as a starting point.
It gives all the contacts for the clubs etc. Go to your local track/club on a Club race weekend (last Sunday of the month) and talk to some of the guys & gals.
You will probably get more help than you can handle.
Victorian Flagmarshalling Team (F4)
AU II XR8 220 Narooma Blue
5sp Manual, Body Kit, Momo wheel/knob, Premium Sound