Saddle height:
A quick setting that should be reasonably good is this:
Put the bike in a doorway. Sit on the saddle, both feet on the pedals.
Now put one heel on the pedal, with your leg straight, but not straining to reach the pedal.

A good starting saddle height is where the heel is just touching the pedal. So then, when you pedal on the ball of the foot, your leg has a reasonable bend at the knee.
Ride that and see. then adjust slightly up or down from there if needed.