Go to your fire and router and add rules there to allow the required ports (7000, 6000 and 6112 iirc) through and port forward 6112 to the IP address of your PC within your network.
LOL. I have no idea what that even means. I feel like a total anti-geek (the CD drive really isn't a coffee cup holder?).
I think I'll skip the hosting idea and just join games. Thanks for the input, though, Hack78. 