Nicolas-Lime-Quokka I'm not sure if you're asking multiple questions at once or if google translate is messing things up.
For a physical card you can only use NFC after you have put the card into a terminal and entered the pin. So you first need to buy something. withdraw money from an ATM and so on. Only then the NFC will be activated and you can use the card to pay contactless.
I don't have Google Pay in my country, so I can only tell you to look at this topic where it is explained how to enable the card with Google Pay: https://together.bunq.com/d/8681-how-do-i-pay-with-google-pay/2
I use Tap&Pay all the time and franky I don't have any reason to switch to Google Pay. I don't have a watch or whatever and I don't like giving all my payment data to Google.
If you can;t get it working perhaps you can tell us what exactly goed wrong so we can help better.