Good Day gentlemen

I currently work at a small Subsidiary of a larger company and my Boss wants to know how we can put a VPN solution in place in order to outsource some developemnt processes allowing the new partner to access through our firewall the systems they need to. I have never installed, configured or designed a VPN solution, yet I have worked around the edges of some and have had to T/S some issues, so I have a familiarity to them. Yet have a severe deficiency in overall understanding. I know CISCO has a complete package when it comes to VPN solutions and I was wondering if I could get some direction on

A: where I could get some good technical data on the basics and

B: Some equipment and configuartion Ideas,

I know I am starting at the lowest level, But I can't think of a better place to begin my VPN Journey except right here