Most of your weight should be on your back foot.
Being consistent with your toss is what will make you a good server, so be sure to practice this frequently.
In an upperhand serve, the trajectory of the ball should be straight. Make sure to follow through after hitting the ball so that your arm is extended out straight towards the net.
Most of your body weight should be on your back foot. Your hips should be squared off with the net.
Keep your eye on the ball where you want to make contact. Transfer your weight from your back foot to your front foot as you hit the ball. Try to drop your holding hand right before hitting the ball. Let your hitting hand follow the ball as it is hit, making sure you follow through straight forward. You can also hit the ball with the bottom of the palm of your hand.
If the ball comes down above the waist you can bump the ball to a teammate with your forearms and fists. If the ball comes down below the waist, you’ll need to do a dig. You can dig by bending your legs and sometimes waist to bump the ball and save it from hitting the court.
Your fingers should be spread out and make a triangle shape with your pointer fingers and thumbs very close together but not touching.
Keep your fingers spread and in the triangle shape, but separate them to put more space in between them as the ball comes to your hands.
Straighten your arms completely when you release the ball for the follow through.
Take a small step with your right foot. Take a bigger, quicker step with your left foot towards where you think the ball is getting set. Take a big step with your right foot to place you at the best take off position to jump. Take a quick small step with your left foot to transfer your momentum to a powerful jump.
With both arms stretched up, bring your hitting hand back by bending your arm at the elbow. Your hand should be open and relaxed. This should create a bow shape with your arms. Your hitting arm swings over the top of the ball and makes contact with the ball high up on it. When you make contact with the ball, snap your wrist down to get the ball to move in a downward motion over the net.