This is my first instuctable so don't be hating!
Pictures taken from www.PortForward.com
Step 1: Static IP
By the way i'm assuming your running on the same system as me (Windows XP) but i believe it is fairly similar on all systems anyway.
To start your going to need to figure out your current IP address and other little things.
Start by clicking start (convenient isn't it) click run and type in "cmd" and hit enter. once in here type in "Ipconfig /all" and hit enter. a few lines of information should pop up. Write down the IP address, Subnet mask, Default Gateway and DNS servers