it is really simple
run as admin and follow.
wget https://git.io/vpn -O openvpn-install.sh && bash openvpn-install.sh
to add an new user
./openvpn-install.sh Looks like OpenVPN is already installed What do you want to do? 1) Add a new user 2) Revoke an existing user 3) Remove OpenVPN 4) Exit
at the end this script is generating you an vpn config, install all the programs and generate all SSL certs for you.
all the configs you can find under