Will Hamilton of Fuzzy Yellow Balls made this video just for you:
Leg Kick on Tennis Serve http://blip.tv/fuzzy-yellow-balls/le...-serve-1190196
But the fact that you are not landing on your left leg is a symptom that you are not properly loading your body to power "up the mountain" at the ball.
For that check out the following video:
Nick Bollettieri-Sonic Serve.wmv http://www.youtube.com/watch?v=ajoZ0f7hw-A