1)I'm assuming you mean from a dunk/layup?Just tap the shoot button again.
2)No clue
3)Get a one on one matchup with your best player,hit the B button to iniate the dribble animation,then just flick the right stick in any direction.This usually frees you up to either drive to the lane or pull up for a mid range shot.Don't try to do it while in the Paint or with a non guard cuz it will probably result in a TO or Foul.And as far as using the hopstep,just use it when your close to the goal and its one on one or whatever,don't ever do it in a crowd.