Guangzhou to Melbourne, Australia

Hi, there is no way to know which gate you should walk to, because the arangement may change. Anyway, after landing, the signages are quite clear to find your way. Generally, here are the procedures:
Arriving - Qurantine & Inspection - Transfer Desk & Immigration - Customs Check on 2F - International Departure Hall on 3F - Checking the boarding gate - Waiting and Boarding

It should be noted that you don't need to reclaim your luggage. Just show the luggage tag receipt at the transfer desk and the staff will arrange for you.