Use
AIO and
SG separately for best results. You can use waxes and sealants together, but make sure to apply the sealant first. If you want to apply several layers of a sealant, you must do that before you apply the wax. Sealants will not bond properly over waxes.
Sheepskin mitts are great for washing. To dry the car, get a waffle weave towel or two.
Yes that process you listed is correct.
The consensus is typically to wait 24hrs between coats of any wax or sealant. The exception is Zaino's claim that you can layer Z2 back-to-back if you mix it with ZFX first. The number of layers that you put on is all up to you. More layers = more protection. There is a "the point of diminishing returns" though. If you notice my sig, I have AIO, then 2 layers of sealant, and then wax. I add a new coat of wax every month if possible, and I consider this process plenty of protection for the winter.