Never . No one can go out of bounds and be the first one to touch the ball.
No. The kicking team is penalized if a kickoff goes out of bounds, but on a punt, the ball is put in play for the receiving team at the point where it goes out of bounds.
a step kick is where you punt the ball out of bounds
Yes, and that is where the ball would be placed.
from the line of scrimmage to where it is recovered/goes out of bounds
No..Only if the punt is dropped can the play continue.
Fair catch interference.
No. Once a player on the kicking or receiving team steps out of bounds, he is ineligible for the remainder of the play.
No, it is not possible or allowed.
Receiving team. Same as a catch. You must have possession before its your ball.