Okay!

pretty much, all you do is hit the ball with a bat and see how far you can send it. Like this.

[he pulls a baseball out of his pocket and tosses it up before swinging the bat and actually getting it pretty far.]

Then the other team tries to catch it while you run to first base and if you can second and third- and if you hit it straight out of bounds it's a home run.

If the other team catches the ball before it hits the ground or tags the base before you can get there then it's an out.