Have you tards never gone bowling..look at a bowling alley, you will see it is 2 different colors about half way down. That is where the "waxing" starts. They wax the floor for the spin. If you throw it normal, it will spin, if you want NO spin, instead of releasing the ball near the floor, release it near your waist, or even higher on the follow through. This will "throw" the ball farther down the lane and not spin much at all.
For right spin, tilt the wiimote to the right, as if turning a key, but with the wiimote, to the right, as you roll the ball.