First time buying a car in aus

Hey guys,

Pom here, recently arrived in Brisbane. I’m looking to buy a car and was wondering if anyone had any tips or things to look out for / avoid.

I’m currently looking on FB marketplace and CarsGuide with a 5-10k budget, anywhere else I should look?

Would you guys say it is necessary that I get a car with both rego and rwc? And how easy is it to transfer a rego? Can it be done there and then?

Thanks a bunch!