I have no idea about 'rules', but every beach I have even been to operates like this;
If you are down wind of the oncoming kite, keep your kite low and bear downwind a safe distance.
If you are upwind, keep your kite high and stay aware to avoid collision.
If there are waves, give way to the person riding the wave.
If there is a trick zone, stay out of this area if your are only tacking...
If unsure, just ask the experienced locals how the spot works. Never met a kiter that isn't happy to chat to another kiter.
Stay safe.