Order of Play
In casual play, determining who tosses the first bag is more or less up to the players themselves. A coin toss will suffice in most circumstances. After the first pitch, players on one side take turns pitching bags until the frame is complete. If a player pitches when it’s not his or her turn, then that bag is removed from play and scored a zero. After all eight bags have been pitched, the frame is over. In singles play, this means walking to the other boards and pitching the bags back. In a doubles match, of course, all players stay in the same pitcher’s box for the entire game.
Sanctioned tournaments typically determine order of play based on seeds, with higher seeds always pitching first. If a match consists of more than one game, then the higher seed will have the benefit of first pitch in every other game starting with the first—a ‘home field advantage,’ so to speak.