Punting fields postion, plz help

[ase]

everytime i am watching NFL, i never understand the punting fields position, plz help me out

i know that after the punting team punts the ball, ball hits the playing field and go into the end zone, it start from 20 yards for the receving team. also, if the ball go directly into the end zone, receving team also start from 20 yards.

following are my question

(1)what is the field position if the ball go directly out of bound (without hitting the playing feild)

(2)what is the field position if the ball hit the playing fields then bounce out of bound (without anyone touch it)


(3)what is the field position if the ball hit the playing fields then player from kicking team touch the ball. after that, the ball bounce out of bound

(4)what is the field position if the ball hit the playing fields then player from kicking receving team touch the ball. after that, the ball bounce out of bound

thanks a lot for help. also, is there a web site that all NFL rules like this that i can go take a look or some kind of ebook store?