Installing a VPN can be difficult, the mailing list and forum are full of examples. Hence my advice:
1) pick a provider that offers OpenVPN 2) follow these instructions: https://github.com/QubesOS-contrib/qubes-tunnel 3) be done with it
I don't mean to imply anything about OpenVPN/Wireguard, various scripts etc. This post is meant to safe the so-called "non-technical" user or the one that has other stuff to do but needs a VPN qube NOW a lot of time an nerves. The above works.