No.
no
yes
Never,.
Yes, it is legal.
yeah it is
Nothing, this is completely legal.
You can as long as the ball is on the plane of the net and you are not over (on there side of the net)
Nooo!
yes, three is the limit though. (bump,pass,spike)
In volleyball, substitutes are legal and quite frequently used, if that's what you're asking.
Yo u can hit it 3 times on each side