Start training yourself. You don't have to have been an elite lifter to be a good coach - I sure as hell wasn't. But you have to at least have been under the bar enough to know why wedon't look up at the bleeding ceiling when we squat!

You do not need to do many different exercises to get strong - you need to get strong on a very few important exercises, movements that train the whole body as a system, not as a collection of separate body parts. The problem with the programs advocated by all the national exercise organizations is that they fail to recognize this basic principle: the body best adapts as a whole organism to stress applied to the whole organism. The more stress that can be applied to as much of the body at one time as possible, the more effective and productive the adaptation will be.

I recommend against a wooden squat rack, for much the same reason that I recommend against a wooden car.

Your ideal body weight as an ectomorph at 6' 0" will be 214.378 lbs. There. Happy? And if you lose or gain a pound, I will have you killed. It is important to be ideal.

On resting in between reps: It varies with the length of the set. 5s or fewer get a breath to reset. Longer sets might take 2 breaths. During the last few reps of a true 20RM squat, just do what Jesus tells you. Trust me, if you do an honest 20 rep program, at some point Jesus will talk to you. On the last day of the program, he asked if he could work in.

Humans are not physically normal in the absence of hard physical effort.

But a hot gym is where most of us have trained before. Learn to deal with it: more water, more minerals, bigger balls.