1.
Couple of events there and the dates. (Saturday arvo sprints and lakeside street sprints are for road registered vehicles only). Not to sure on the TopGear Car Racing or Queensland Racing Drivers Championship best to just go out on a day its on and have a look, ask some questions.
Hill climbs are run by MG Car Club of Queensland
And there are motorkhanas run by Holden Sporting Car Club of Queensland
2.
I've never had my car checked for anything at sprints but it is road registered so not sure how they go about checking race cars.
For cams approved events your car must comply with the cams rules. Having my car check for a motorkhana only had to tape up the position terminal on my battery. They where checking things like seats secure and seatbelts, mainly safety stuff and no oil leaks etc.
3. Don't think you need a cams licence for QR events as they run under their Australia Auto Sport Alliance (AASA). You do need one for Motorkhana and Hill climbs though.
4. Yes lakeside is so much better then QR. Its owned by QR so the same rules apply. Only other thing to remember is the car must be under 95db.
5. Just go out and have a look, you can walk around the pits on sprint days (not sure about race days) and talk to people ask questions etc.
Thats all I can think of atm.