Here are videos showing the 7 exercises, along with some tips for avoiding potential damage (don't slide down after the wall sit, for example, push up, so you don't damage your knees):
Squat form video is wrong. Don't do that with weight.
Your toes need to be pointed out 30 degrees and knees spread apart, crotch opened as far as possible.
You'll find a lot of wrong YouTube videos. It's a minefield of fitness non-experts trying to make a profit. Follow Starting Strength form recommendations and make sure the videos you're watching follow them approximately.
http://lifehacker.com/these-12-videos-show-the-proper-form-f...