Not buggin at all. The whole point of these forums is to share information.
the preload is there to adjust for your weight and sag of the machine. I'm a fat bastard, so i have my spring cranked. Keep in mind the more you "preload" the spring , you are reducing the travel of the shock.
Rebound: This is probablly one of the most critical adjustments on your shock. It' controls how fast the shock returns to full lenght after being compressed.
Here's how i adjust mine: Find a place with a decent whoop section. Try and go through them as fast as you can. If you find your back end is "bucking" you, then you need to turn the adjuster in, to "slow" down the return rate. If you find that over the final end of the whoops the shock is bottoming out, then you need to turn the adjuster out, to "speed" up the return rate. The more you test and tune the more you'll understand how it works, thus in turn you will be a faster rider.