Click on a ball with the mouse and drag back to aim and shoot.
The cue ball is typically only used on the break. After the break, you can click on any ball to shoot it. You don't need to wait for the balls to stop moving to shoot again. Follow the instructions to learn the special effects of different things. The object is to hit same-colored balls together, which removes them from the table.
Don't forget to get all of the tiny balls if they are on the table.