Setting up Google Mini Nest is out of our scope but we can provide you the basic settings to access the internet. First, you need to check what type of NBN service you have and visit this article as it has a guide: New Connection Setup Help
You may contact Google support for further assistance in setting up their product.
I have recenltly purchased a Google Mini Nest and have been unable to get it to connect to the wifi. Any assistance would be greatly appreciated.