The direction of the serve should be:
To a weak player.
To any substitute
Where any player is not.
To any player who missed or messed up the last play.
To large open areas.
To the perimeter of the court.
Into the setter lanes or between players
Away from their strong players.
Where a coach has directed you to serve the ball according to numbers on the court.
Make sure your serve goes in when:
The first serve of the game for your team.
After a time out or substitution.
When the teammate before you made a bad serve.
After winning a long rally.
After any block for a point.
Game point either way.
Whenever you have fallen behind by three points.
Whenever either team is within 3 points from winning.
After scoring three consecutive points.
After the opponent has scored more than two points in a row.