Ready position
Now, lets start with basics…
To execute an overhead floater serve, stand comfortably with your nondominant foot slightly forward. Be sure that your weight is on your back foot. Hold the ball with your nonserving hand in front of your serving shoulder.
Slide your front foot forward and feel your body weight shift from your back foot to your front foot. As you step forward, toss the ball directly in front of your serving shoulder high enough to force you to reach with your serving hand.