click it
It varies from server to server.
Port forward your router. Find out more at www.srcds.com
own a server or ask the owner to make you admin
Buy Garry's mod 10 off of steam.
Check with a server mod or server owner about the faction mod he/she uses
Garry's Mod 10
technically yes, there were a few updates it is still called Garrys mod 10 though
for that you probably will have to buy?/rent a server. you can get one at the related links below.
no because garrys mod requires that you have a game that uses the source engine
Garry's Mod has now updated and includes all features of 13 Beta
Garry's mod tornado
Steam