I don’t completely agree with starting with the spine. What if your spine is the way it is because your feet, hips, or pelvis are out of whack? It would be like fixing the crooked walls in your house while ignoring the crumbling foundation. If you have a leg length discrepancy (whether it be anatomical or functional) chances are good your back will pay the price eventually. 

I asked my physical therapist basically the same question, where do you start when you have so many things wrong that all seem to re-inforce each other. His response was the big toe. I was seeing him for ankle, knee, and hip problems so his answer might have been different if the problems were higher up.