The 4000 rpm screwguns are intended for metal studs; the 2500 rpm
screwguns are better for the wood framing. Buying a used or refurb 2500
rpm screwgun is the right choice. BTW, obtain hearing protection...in
use, the trigger is locked ON since the clutch determines when a
fastener is driven. That's a noisy whine to listen to for hours on end,
even if the noise is not from the one you're using.

The tool list goes like this -
Screwgun, extension cord
Speed square, carpenter's pencils
Drywall square, utility knife
Rasp or drywall plane to trim to fit
Lipstick for marking outlets
Regular claw hammer and pouch for screws
First-aid kit
Big honking circulating fan to blow air/dust out a window