A complete guide for Open VPN installation

Hi, I need a complete guide to install a Open VPN server on Ubuntu 14.04 Server and VPN clients on windows Here are the requirements. * Server should be able to access Windows clients' MS SQL server port only. * Clients can not access to internet over the Open VPN Server, they should use their own internet connection. * Each client should have their own username. * Clients can not access to each other. * Clients should start the VPN daemon automatically on start up. The documentation should be similar to: [login to view URL]