How do I install the game to play? This is what I've currently done so far:
I've got steam installed (duh)
For games, I bought the CS:S and got the HL2: DM Installed, along with Insurgency.
I've also downloaded PVK II, but when it shows what I want to open it up with, I don't know what to do from there. I'm also downloading Source SDK: Base as I type this (97%). Help for a newb?