Search around this channel for some good info http://www.youtube.com/user/ (sanfranciscocrossfit)
Key points, you need to get your body pliable with foam rolling and other soft tissue modalities, get your body grooving good movement patterns through mobility drills, and then work on loading the patterns.
Something to shoot for, is to be able to squat to depth with enough hip and ankle mobility so that you don't over compensate for lack of mobility in other areas which can cause injury such as your lower back.
Read up on Dan John's swing article and learn how to hip hinge properly to get your lower torso moving in alignment with your hips to help carry over to your squat
This is just general info, but it sounds like your not in any position to be loading up your squat, put some serious work into these drills and keep us posted on your progress