VPN Setup for Secure Access

I need to configure a VPN connection to allow a branch office computer to access a government application currently restricted to the head office.

Requirements:
- Install VPN on branch computer to connect to head office network.
- Use business-grade TP-Link router with VPN server and firewall capabilities.

Ideal Skills:
- Experience with TP-Link routers
- VPN setup and configuration expertise
- Networking knowledge, especially with business-grade equipment