Here are a few sites to either find a call sign. Also take the Foundation Licence online and a couple of other help sites.
This is where you go to get details about getting your licence, change your callsign, fees etc..https://www.amc.edu.au/industry/amateur-radio
Here’s a link if you want to make a booking to do your exam online
Here’s a link to check what callsign are available
Here’s a link to practice your theory test online
Here’s where you can purchase the foundation manual
Here is a very good online course. Click Here: for Basic to Advanced Information.