A couple official guides from AMD:
For Phenom II, Athlon II users on the AM2+ or AM3 platform:
For FX CPU AM3+ platfform:
Gigabyte's llano APU overclocking guide:
Plenty of other nice home brewed guides out there on the various tech forums too.
Use that search function in your internet browser. It's your friend.
But always, if you have a specific question, just ask. Just be sure to read the stickies first and follow the rules so you don't look like an asshat.
If your aunt had balls, she'd be your uncle.