For strike point..
After you address the ball hold the big button that's in between the little buttons (A button??) then moving the MOVE towards the ground lowers the strike point and raising the controller raises it. when you have it set, let go of the button..and swing away.
Stance: Point the mover at the screen and hold the same button or it might be the trigger, then left and right changes stance.
Have no idea about practice swing. Didnt know you could..