These articles by Dave Tate are outstanding. Some of the information may not be completely up to date with current Westside philosophy, but it is still very solid information. Take your time with them and post up a comment or two if you'd like.
Squatting From Head to Toe: Introducing the Box Squat
Squat 900 Pounds: 10 surefire ways to help you squat BIG
Squat Training Westside Barbell Style