Step 3: Find and install gmod
1.go to youre desktop and you will see a steam shortcut click on this and it then go to the tab that says MY GAMES this will show you the games you have bought! YAY! nearly done :D click on this.
2.here are youre games (note: mine are already installed when you look here you just need to highlight the game you want to install first then click install).
the games take 30mins to 1hour each to install varying on the speed of your pc/laptop/mac and the amount of disk space you have left, i have a laptop with vista and intel dual core-and took me 45mins to install each.