OPENVPN Server Setup on Home Netgear Router R6220

I'm in need of an IT professional with expertise in Network Administration and the Linux operating system. The task at hand involves setting up an OPENVPN server on my home network router. I have already installed OPENWRT FIRMWARE, which is based on Linux, on my Netgear router / model: Netgear R6220.

Please note that: This setup is implemented on my SECOND router acted as Access Point / Switch, and this second router is connected to "Main Router" through the cable (The Main Router is the router given by the ISP).

Key Responsibilities:
- Comprehending specific router configurations.
- Competently implementing OPENVPN server installation and setup on my Netgear router.
- Export to a OpenVPN Client Config File.
- Able to connect from my Linux VPS / Windows 10 VPS using OpenVPN Client Configuration file.
- All traffics within my VPS must direct through my home router network.

Project Requirements:
- Proficiency in Linux and Network Administration.
- Past experience with setting up OPENVPN servers is highly beneficial, therefore please include any relevant past work in your application.

Please note: No VPN software or packages have been previously installed on the router. Your thorough understanding and skilful handling of the task is crucial to the success of this project.