Whomever the ball lands closest following a previous point is the designated server. In event of a dispute, the player who lost the last point shall nominate the server.
A legitimate serve is where the ball is struck away from the server and cleanly strikes the top surface of the table. The ball may not exit the table spinning towards the server.
In an enclosed area, the ball may strike a wall before the table, so long as it does not exit the table on the side where the player first served.
If the ball bounces off the table and either hits the wall (in an enclosed area), or lands outside of the 10ft markers, without first touching the paddle of the other player, then the ball is 'out' and the point is lost.
A ball that would have been 'out', but is prevented from being so by hitting the other player by accident, is still classed as 'out'.