make small touches with the ball of your foot in between the arch and your toes. practice rotating feet. its much harder to do it with one foot. i wouldn't try doing sole stall until you are comfortable with sole juggling, because i think that gaining the control of juggling first makes sole stall much easier. when you do get to sole stall its normall done in the middle of the foot. its really hard and kind of frustrating, but keep at it and you will eventually get it.