Setup Wireless Client Mode with router through vpn connection

Hello. This is my first time with lede and installed 17.01.4. Can someone direct me to a existing setup guide or some sage wisdom for the below configuration.

I want to setup a separate network with my dual band router(lede). Mainly it will connect via wireless client mode(no encryption) on the 5ghz band to my main router. At this point the lede should connect via vpn to my vps and function as a router (lan ports including the wan port and separate wireless 2ghz access point) directing all traffic through the vpn.

What are the main settings I need to configure through luci to make sure the router routes everything through the vpn via the 5ghz wireless connection acting as the wan port.

I hope I explained this well. Thank you for your assistance.