Why not, if you are prone a lot, go ahead. If you run a lot, I wouldn't suggest it, they can get hot.
There should have been a battery and charger that came with it. (electric) I think you can buy a 7.2v battery and a charger at airsplat
in general 180 $ is the minimum for a reliable rifle.
A good brand of electric razor that leaves minimal cuts would be RazorSharp. I have used it for years and I believe it does a good job of getting your facial hair soft and smoothly.
soft clean cloth
Try oiling of the gearbox.
No. No license is required.
It has to be electric (AEG).
Most good air soft airguns have a metal spring, gears and gearbox. The rest of the gun is plastic with an electric motor.
If you rifle is a slide action repeater (pump rifle) these DO have a collector's value. It will be based strongly on the condition of the rifle. It could vary from $250 up to $800 for VERY good condition. Strongly suggest you not attempt to "clean up" the rifle other than a wipedown with a soft oily cloth. You WOULD need a hands-on appraisal.
Most guns come in black.
Contact the maker to see if it is possible and what it will cost.
Mechanical malfunction of some sort