To serve in pickleball, stand behind the baseline and keep both feet behind the line until the ball is struck. The server must hit the ball below the waist and serve diagonally to the opponent's service court. The serve must clear the non-volley zone and land in the opponent's service court. If it fails to do so, it's considered a fault. Players must alternate the server after each point, and the serve must be done underhand. It's essential to keep the ball low and in the court's corners to make it harder for the opponent to return the serve.