Most players want to improve their serves, but many of them don’t know where to start.  Here is what I would recommend…
 
#1 Decide what serves best match your game
 
#2 Find a top player who serves those exact serves
Here are some sample videos…
http://www.youtube.com/watch?v=wbrmRarOysk&feature=related
http://www.youtube.com/watch?v=miIX2BxpQ4E
http://www.youtube.com/watch?v=PD02s8uTSzw
http://www.youtube.com/watch?
http://www.youtube.com/watch?v=gfDVXPrLVkg&feature=related
http://www.youtube.com/watch?v=loKDYGxgFik&feature=related
http://www.youtube.com/watch?v=Q4xuFQB0tzI
http://www.youtube.com/watch?v=3HlZi7dTCV8&feature=related
http://www.youtube.com/watch?v=weeh13cRaWU&feature=fvwrel
http://www.youtube.com/watch?v=psqmHQYKDYs&feature=related
http://www.youtube.com/watch?
http://www.youtube.com/watch?v=GUbDgh_Ks9Q
http://www.youtube.com/watch?v=OTFxcuWP5t8 (watch the last 45 seconds)
 
#3 Perfect your motion without the ball
 
#4 Try to generate spin first by using your wrist – don’t worry about keeping the serve short and low
 
#5 Perfect your serve by keeping it low while varying the placement, spin, depth, and motion
 
#6 Use it in practice matches use it in tournament matches and be persistent over an extended period of time