Here are some key contacts:

The Police: dial 000 (24/7 in emergencies)
1800 Respect national helpline: 1800 737 732 or https://1800respect.org.au/ (24/7 for DV counselling & advice)
Child Protection Helpline: 132 111
Lifeline: 131 114 or https://www.lifeline.org.au/get-help