Yes that's why you should wear protective clothing.
No.
Anything is possible but not likely with air soft. But they do hurt when they hit you. Simply don't shoot anyone with an air soft gun. Treat it like a real gun.
It has to be electric (AEG).
You can buy an Electric Airsoft Gun (AEG) online or at a sporting goods store.
No, not if it's designed to do so.
A spring, an electric motor or by compressed gas.
An automatic electric gun would be the best
An air soft gun would hurt much more than a Nerf gun. A Nerf gun only shoots foam at an extremely slow speed but an air soft gun is pressurized and shoots bb's at a much faster speed.
depends from what range but from say 10 feet it hurts a bit
They Sting, they hurt, and they cause a welt, but will not kill you under normal circumstances.
The cheapest place I think is airsplat.com. They have the best and cheapest guns there
Air soft is the common term, soft air is the correct name.