far as I understand, that's not serving a VPN, there is no point you want to connect through your router by another router on the street, the VPN serves so you can connect to your server, in this case would be your computer and to access shares q you have there, in this case assume a hypothetical case, you're in a McDonalds, and connect to the Internet there, and want a document that you have in your home computer (which you previously configured as a server) then, from your mobile, to mcDonalds, and passing through the router in your home, you can grab the file from your computer. so the first step is to configure the server. and with this only if you feel you explain that interests you. Greetings!