"Find out which ports your particular game uses (ie. google) "
Go to Google, type your game's name, and type the word "ports", no quotes. Press enter, see what comes up, write down any and all port numbers that the links say your game uses, those will need to be "forwarded" in your routers config pages.
Next you need to read the manual (rtfm) for your router, looking for the section on FORWARDING PORTS.
We can help you guy, but you gotta do some legwork and meet us halfway
