please im starting to think a waste of money please help

i got Garry’s mod with Counter strike source a week ago and so did my friend but hes running it with portal, i wanted to play multilayer with him and found out one of us needed a dedicated server so i went to you tube the place which fixes most of my game problems. I got hldupdate tool and got it to where the server is running but for some reason my friend clicks on my server and it tells him not responding is there something i have to do?

You have to Forward Your Ports. Have your dad help you. (if you live with your dad) Then you need to disable any firewalls blocking the .cmd file. (I think it is a .cmd file)

If you want to play multiplayer, Why not join one of the well over 1,000 GMod servers already available?

Yeah, it’s best that you play on other’s servers before you go off starting your own… Just my $0.02

Also you don’t need to get a dedicated server. Just port forward then boot up GMod and make a multiplayer game.