The net game is all about following the basics. The arguably best net player of recent history, Edberg, volleyed so well because his fundamentals were spot on every time. Get your fundamentals to be really solid and you will be fine up at net.
-Doing a split step while your opponent strikes the ball, so that you aren't caught flat footed.
-Stepping into the volley with the opposite foot (volley on right side of the body -> step in with your left foot) so that your body is fairly closed at contact
-When the ball is low, you go into your knees and get your body to the height of the ball.
-The volley is a short punching motion. You do not take the racquet back too far or swing at the volley.
Everything beyond that is practice and repetition.
Wilson BLX Pro Staff Six.One 95 (customized) 8.8 Pts HL, 355g, around 330 swingweight
Pro's Pro Intense Heat Blue 1.25 @19kg (42lbs)