Hi @luxecosmetics ,
Nick here from Shopify. Great question, figuring out shipping logistics can be difficult even on the best of days!
The good news is Shopify Shipping is available in Australia, but it seems like it is with the Shipping Carrier “Sendle”. It doesn’t seem like Australia post is available for Shopify Shipping in Australia right now. I’m based in Europe, and not overly familiar with Australian shipping labels, so I can’t comment more on if this is a popular or well known carrier for you.
You can read more about Shopify Shipping here and how to set it up here.
Because Australia post isn’t available for this, maybe @PluginHive 's suggestion of the app route could be a potential work around for the time being if that suited you at all!
I hope this helps and answered your questions. Let me know if you have any more.
Thanks, Nick