/3/ - 3DCG

First time sculpting the human body. This is as far as I could get before hitting a roadblock. I have a few questions.

The scale on my mesh is obviously off. Legs are disproportionate to the arms, torso is too long, etc. How can I fix this? Do I just eyeball it until it looks right?

I've already defined the largest muscle and fat areas, and now don't know where to add more detail for when I start sculpting with higher subdvisions. Where can I find reference material to help with this?

Any good retopologizing tutorials for zbrush or max?

Is there a way to preview my mesh in zbrush that more closely resembles what I would see in max? I'm constantly switching between programs and adjusting things because the mesh looks different in both.