Travelling on an australian passport, can I have a 72 hour stopover in Guangzhou without a visa.

is there any additional costs.
And do I need to have accommodation booked prior to landing .
Is there a questionaire to fill out ?
so to summarisse ...All I need to do is tell the airline upon boarding that I'm staying on 72 hour free transit and have a valid passport and airline tickets to my final destination.
thanks karen
We are going on to Thailand and a visa is not required ....what happens then?