Hi,
for creating a simple peer to peer network between two clients you do not have to setup a complete X.509 certificate based infrastructure. You can use a static key created by OpenVPN for such purposes.
In a Point-To-Point environment one Computer acts as server (vpnmachine1: 192.168.200.1) the other as client (vpnmachine2: 192.168.200.2).
Continue reading OpenVPN: Create a peer to peer Network between two Clients