A volleyball serve can be hit either overarm or underarm. A player is allowed to travel with the ball and jump whilst serving, and providing it reaches the opponent's court, it is deemed legal. Unlike some sports, the ball is even allowed to touch the net.
Stage one
Stand in position on the balls of your feet, with knees slightly flexed.
Face forwards with your chest facing towards the target.
Hold the ball in front of your body with left hand, right hand held back.
Body weight should be on the back foot.
Stage two
Throw the ball gently into the air, swing the straight arm forward to strike underneath the ball with the heel of the hand, with your fingers clenched.
Transfer bodyweight from back to front foot.
Stage three
Follow through with the fist pointing towards the intended target or the sky.