Drywall is the standard covering of the interior frame of many houses.
You use scrap pieces of drywall and joint compound.
PVA is not commonly used on drywall.
No, you don't use drywall anchors if you can use a stud.
Regular drywall primer.
Yes, you can use Kilz over drywall. It is an undercoat, or primer.
for insulation
You use standard 1/2 inch drywall .
You can use drywall nails or drywall screws. I prefer the screws.
For interior walls you want to use 1/2 inch size drywall. You want to use the thicker drywall because its stronger and it's a lot harder to damage than the thinner drywall.
It is possible to use VCR mounts on drywall. Some VCRs come with mounts specifically for use on drywall. In the long run, however, it is probably best to secure the VCR mount on a wall stud, rather than just hanging it on the drywall.
There are several types of paint you can use depending on the result you would like to achieve and the area you are covering. Matt, eggshell, satin and gloss all can be used on drywall with different finishes.
Yes, you can use it.