WA law is different. But this is a good start
www.familycourt.wa.gov.au
Here is another one
Learn about self-representation in Australian family law parenting matters in Federal Circuit & Family Court. Get expert guidance. Call 1300 636 846.
www.gotocourt.com.au
You're gonna have to read, read and read some more.
This is the best starting point for where / how to apply
www.federalcircuitcourt.gov.au