From the official FIP rulebook:
Rule 6.1. At the start of the service the player serving must stand with one foot behind the service line, between the imaginary prolongation of the central line of serve and the sidewall (service box) and must remain there until the ball has been
served.
Rule 6.3. The server may not touch the service line with their feet, nor the imaginary central line.
Rule 6.5. The ball is served from the right side of the court it should pass diagonally over the net towards the receiving box of service of the person receiving the ball. It must bounce within the lines that limit this box. In the first instance the serve must go into the receiver’s box located at his left side, and, when one side wins the point, it is time for the following service and the ball must go into the receiver’s box located at his right side, and so on alternatively.