how do we setup our VPN?

We are having a firewall installed on our DSL line and are planning to setup VPN to access over that line. What are the steps involved to setting up the client? Is it all built into Windows 2000 on the client side and only requires configuration?What are the config steps on the client computer and what do we need to know from the guy installing the Linux Firewall in order to allow the “tunnel”? any urls for this?