How are misconduct and complaints reported?

Conduct complaints (abuse, bullying, harassment, discrimination or safeguarding concerns) are handled under Football Australia's Member Protection Framework and its National Complaints Procedure, which you can download from https://www.footballaustralia.com.au/member-protection/complaints-procedure. That page has a flowchart, FAQs and a link to contact your state Member Protection Information Officer (MPIO).

Match results themselves are only recorded to help place teams in suitable leagues, are never published, and there are no points tables, so a serious conduct issue should go through the complaints procedure rather than being left to the competition.

Sources: https://www.footballaustralia.com.au/member-protection-framework and the Coles MiniRoos National Playing Formats and Rules.