Minus 18 has some great resources and training videos

It includes this inclusive language guide

Great videos for young people

How to be trans ally- 7 minute video

Using pronouns- 5 minutes

RCH standards of care and treatment guidelines for Trans and Gender diverse Young People

The Australian Standards of Care and Treatment Guidelines (ASOCTG) aim to maximise quality care provision to trans and gender diverse children and adolescents across Australia, whilst recognising the unique circumstances of providing such care to this population.
Recommendations are made based on available empirical evidence and clinician consensus, and have been developed in consultation with professionals working with the trans and gender diverse population across Australia and New Zealand from multiple disciplines, trans and gender diverse support organisations, as well as trans children and adolescents and their families.
They have been endorsed by the Australian and New Zealand Professional Association for Transgender Health (ANZPATH), the peak organisation in the region actively promoting communication and collaboration amongst professionals of all disciplines involved in the healthcare, rights and wellbeing of people who identify as trans or gender diverse.

To download:

From Blues to Rainbows Report on the Mental Health and Wellbeing of gender diverse and transgender young people in Australia

Survey report of the mental health and well-being of gender diverse and transgender young people in Australia.