On the serve, I focus on four things: Toss, Head up, Extension, and snap.

You must be solid in all categories for a strong serve.

1. Toss high and slightly out in front.
2. Keep your head up on the ball. If you are not watching the ball how are you gonna hit it?
3. Extend your elbow up to attack the ball, and finally
4. Snap your wrist to bring the ball down in your appropriate box.

If you focus on these four things, it will be a great beginning to a strong serve.