Functional Movement Screen - Overhead squat/In-line Lunge/Seated Roatation (not as important)/Laying Straight Leg Raise.  The majority of these you can find online through Youtube, or google Gray Cook FMS.  If you could film/take pics I could interpret or help, there's basically a whole bunch you can learn from this.  Overhead squat look at, low back position (arch/rounded) feet/ankles (pronate/heels come up).  Thats where I'd start.

Yeah at least start there or I'm guessing a lot of them are on Youtube also, its almost best if you have a friend kind of watching just to try and tell u what it is that your doing even if they can't interpret it, for example O/head squat, arms falling forward (almost everyone), heels coming off the ground really quickly, feet trying to roll in along with knees caving in, OR feet rolling out and knees pushing out.  In line lunge is a lot about balancing in that position, and hip flexor on the rear leg.  Straight leg raise, is a lot of hamstring flexibility as u can imagine.