Use the basic rules of softball and baseball: four bases to run, three chances to kick the ball and three outs to an inning.
The pitcher rolls the ball to the kicker. Bouncing, other than the little bounces that you get when the ball rolls over grass, is not allowed. If the ball rolls over home plate and is not kicked, that is a strike. If the ball is kicked but goes foul, that is a strike.
The fielder can catch the ball and tag the runner, or step on the base, or throw the ball at the runner to make the out. The ball should not be thrown at the runner’s head. If the ball is thrown at the runner and misses, the runner may advance only one additional base. A kicked ball that is caught in the air is an out.
The team that is in the field should space themselves out according to the numbers of players. They will, of course, move in for the smaller players and out for the stronger players.