I'd love to know how to make a server for Gmod10 and Counter Strike: Source on Steam, ive got some great processing power here and i wanna share it

Ive been told my router is stopping me from making this happen though, when i make a mutliplayer game, no-one joins or can join, they get a "server is not responding" message.
I'm using a BT Voyager 2091 wireless router, can anyone help me out with this?.
Also, can someone tell me how to make a server using the Zombie Survival mod (on Gmod10) and Stalker mod (also on Gmod10)
Thanks alot!.































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