It will show up on the lan list because your hosting it, and its going into your router. goto www.ipchicken.com get that IP give it to a friend. If he joins no need for it. If not, post a thread on yahoo answers or somthing. And mabye they will tell you how.
Or go to http://www.PortForward.com and look for one closest to yours. if u cant find it. Then post a thread on yahoo, or google it.
The ports u need open are:
srcds
27015 - 27020 UDP, TCP
27005 UDP, TCP
InGame(Listen)
27015 - 27020
27005 - 27005
27039 - 27039
ALL UDP and TCP
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i can tell you how to get intop your router tho. go to start\run and type CMD press enter, when CMD comes up. Type in IP config. Now Your Default gateway is the IP to your router. Put that into your internet browser. And u should be on your router page.