Selling in Australia? Are you? Help needed

We sell in the UK and EU and now want to sell in OZ.
What do you actually need?
To sell in the EU we got our German EU EORI number, tax and vat ect. Not Sure if we need a GST as not a resident and of course will pay all the import duties and tax at customs, just the same as sending to the EU now.

Just want to get any numbers required for Amazon before we open up the OZ market place.