@mani_4 I recommend you check out our Multi-Carrier Shipping Labels app for shipping. It covers major carriers like FedEx, DHL, Australia Post, Sendle, TNT, to name a few. This will help you cover domestic shipping within Australia, and even international shipping when you decide to scale up.
The app integrates seamlessly with the Shopify store and shipping profiles. You can try out the app for free for 14 days and let me know if you have any queries regarding shipping.