If you youtube 'Christian Mcdonald', he explains everything in his series of videos. He's also overseeing the wireguard package for netgate, and talks about the whole process and where he wants to take it in the future.
Hello!
Speaking of netgate.com, we found this article on it which looks good: https://docs.netgate.com/pfsense/en/latest/recipes/wireguard-client.html
In order to fit it to AirVPN, please generate a configuration file for WireGuard and the server or country you wish from the Configuration Generator. It's a text file inside which you can find the settings/values you need.
Kind regards