1: Juggling is a about making good throws, not amazing catches.

2: the motion for juggling should be practiced before juggling itself is practiced.
a Standing with your feet shoulder width apart, with your arms hanging down at your sides, bend your elbows 90 degrees so they are directly forward.
b move your right hand in a U shape that goes away from your body, to the right, but not away towards the front. Bring your hand in the U shape to about belt height,. The outter most part of the U should come UP the center of your body. Your hand should always be about 3 inches from your chest
C) repeat the motion with your left hand (no balls in hand at this point)
D) Alternate. It seems silly... but this is the "perfect" juggling motion.

3: If you do it right... the ball from your right hand... will pass the ball from your left hand while they are in mid air, AND the right hand ball will pass on the LEFT side of the left hand ball.. and vice versa.

that's proper form. I can juggle 3, and I'm working on 4.. but I never really tried to learn.