Basically if you use one to make a $, its considered a UAV and the rules applicable to UAVs apply.
If you use one purely for a hobby (sport or recreation), its considered a model aircraft, and another rule set applies.
Re operations in controlled airspace, Airservices has a summary of what is required.
Unmanned Aerial Systems in Controlled Airspace | Airservices
CASA could in part address the ignorance of Joe Public by putting reasonable size ads in some of the daily newspapers outlining the rules re can and what can't be done.
There was talk of a draft Advisory Circular a good 18 months ago, but now I guess they have moved on to the NPRM.