How do i get game for free/play private server

Well im kinda new with it and i got bored of mw2 private servers.... so i want to play cod 5 nazi zombies on computer any site or something with downloads

since if i give u links i will get banned, just go on piratebay serach for call of duty world at war and download the one with most seeds most positive things on it, to insure it doesnt have a virus then go on google search for call of duty world at war patch 1.1, 1.2, 1.3 etc all the way to 1.7 then go on google n search for call of duty world at war 1.7 lan fix, then get tunngle or hamachi join a cod waw network and go on coop then go on lan and u should see some servers if anyone is hosting.