Hi, I want to put up dry walls in my garage (average size 2 car
garage), I also need to replace the garage door and the opener. I will
hire a contractor to do it. But I am wondering about the order I
should do them in.

I am thinking

Garage door/opener
Putting insulation on the side
Drywall?

What about the ceiling? How do they put drywalls in the garage to form
a ceiling? Right now there doesn't seem to be a lot of beams they can
nail the dry wall for the ceiling. Do they need to add some support
beams for the ceiling? How about insulation for the ceiling? Are
those usually done?

There are also not much electrical outlets and lights in the garage,
too dim. Does the electrical work happen before or after the drywall?
At the minimum I want to have some florecent lights on both side of
the garage, does the electrican usually lay out all the wires before
putting up the drywall?

Thanks!