free throw violations

[pinchmaster]

Hi friends,not sure of the proper procedures on a few situations.
I bounced the ball to the free thrower (now at his disposal),for two shots.(fouled on attempt,no basket). 1- does anybody HAVE TO stand in the spaces?The book says MAY.
2- B1 moves from outside arc to unoccupied space (while ball is at shooters disposal remember).violation right? What is the enforcement if the ball hasnt left the hand of shooter yet? 3 shots to make 2?
3- same thing as no2 but shooter is in 1 and 1 situation, give him 2?
4- what if a2 is the violator in the same situations.
cant find situations like that in case book
thank you