Gray Cook is simply phenomenal. The more you listen the more you'll learn.
What we do depends on where an individual is, but if you allow that I have no clue on your current capacity, I'll give you some options.
(use a 2x4 as a heel lift at first - this will help you stabilize - apply the breathing pressure to the squat)
Intermediate: apply the breathing pressure to your movements
Advanced: asymmetrical loads...
That's a lot to throw at you but start with the basics and you're welcome to ask more questions