The following moderators provide local knowledge and expertise for Cockroaches (Blattodea, several families):
KimberiRP | Illilanga | trevorpreston | CarbonAI | mcosgrove
A good reference for Cockroaches is the book “A Guide to the Cockroaches of Australia” by David Rentz. https://www.publish.csiro.au/book/6710/
This webpage by the CSIRO is also useful:
http://anic.ento.csiro.au/insectfamilies/order_overview.aspx?OrderID=42509&PageID=overview
CarbonAI is active.
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