http://www.feeltennis.net/serve-technique/
If you want to learn how to serve in tennis with correct technique, then follow these 7 steps that guide you through proper technical progressions.
You’ll learn proper serve stance, how to find a continental grip, how to learn the pronation through two swing paths, how to coordinate both arms so that the tennis serve toss and the backswing work in harmony, how to generate the most power through the racquet lag and what’s the key to a proper follow-through on the serve.
The last part of learning how to serve in tennis shows you drills that help you find the fluid motion again if you lost it while you were practicing only small parts of the complete tennis serve.
source
