This guide will show you how to install Team Fortress 2 to your computer. It is fairly simple, but the game is quite big so it might take a while to download. If you already have steam, skip to step 7.
Step 1: Go to http://store.steampowered.com/ and scroll to the bottom of the page.
Step 2: Hit the "Install Now" button.
Step 3: Wait for Steam to download, then run the installation.
Step 4: Just install steam like a normal program.
Step 5: Once it is complete, run Steam if it doesn't open. It should ask you to login or register.
Step 6: Go ahead and register. (if you have a Playstation account I think there is a button for logging in with that.)
Step 7: Once you are logged in, you should see something at the top where you can type in with a magnifying glass near it.
Step 8: Go ahead and type "Team Fortress 2" in.
Step 9: Click on Team Fortress 2 when it pops up..
Step 10: Find the install button and click it. It will ask you if you want to install it and give you an estimated download time.
Step 11: Wait for it to finish downloading.
Step 12: Boot it up and see if it works. If it does, proceed through training.
Step 13: You are done! Congrats, you just installed TF2 for free!
One quick thing, to boot it up, press the "play" button.