To do after install:

Create SSL keys with OpenVPN EasyRSA : 
  https://github.com/OpenVPN/easy-rsa
  https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-18-04
  
  !!!The client ovpn files will require modification to include the latest CA key of the new server!!!
  
Edit config 
Clone example config /etc/tbServer/bin/includes/config.json.example and complete the values
  /etc/tbServer/bin/includes/config.json
  +DB credentials for twinbridge database
  +DB credentials for WordPress database
  +SMTP credentials for email account