If you want to self host check out Wireguard options like Netmaker, Headscale, Netbird, etc. these all allow you the ability to setup a machine as an exit node into a LAN, and allow LAN to LAN communication. If you are just looking for a VPN and don’t have to self host, then Tailscale might be a good starting point. Figure out the setup you like, then move to a self hosted headscale setup later using that as a model.