Alright, this is gonna be fun!
First, you want to run a stress test to make sure your processor is stable and also to make sure that your cooling is efficient. I would try Prime95 for the stress test. Run this for a while (a couple hours is best, but thirty minutes might suffice). If your CPU passes without crashing or shutting down due to heat you can move to this guide.
Make sure you do this first and after ANY voltage changes to the CPU!
Guide: http://www.xtremesystems.org/forums/showthread.php?275891-Bulldozer-Overclocking-Guide-(Performance-Scaling-Charts-max-OCs)LN2-Results-coming!
This is a good guide that runs you through the overall process. Unfortunately I would be sitting here typing for hours to get you through the same process that this article already has.
Have fun! Just remember to be careful and check everything twice, a bad voltage or setting can destroy a CPU if you are not careful!
Also, make sure you have a good cooler to keep the CPU cool, that is a must!