Before you try overclocking, you need to make sure your cpu temps are safe.
I like
core temp but there are other programs out there.
If you get around 50*C - 55*C on load then you do not want to overclock
Most people clock by changing BIOS settings, so if you have access to those you can overclock. Even if you don't, you might be able to overclock some by using the Asus AI Booster (provided your mobo supports it) but the AI Booster always locks up my computer
this thread will help you with amd clocking basics.
It's a bit dated, so there are a few things you'll have to disregard
-keep the HTT at or under 2000MHz (and not 1000MHz) in your case
-max cpu voltage still seems to be around 1.5V on air
-ram voltages are going to be different for you, the [jedec] standard ddr2 voltage is 2.1V whereas the [jedec] ddr voltage is somewhere around 2.5 V or 2.6 V
-pci/agp lock is obsolete, you'll probably see a pci-e clock and pci clock
messing with the pci-e clock has never worked out for me...wouldn't affect the cpu speed at all anyway. Keeping the pci clock at 33MHz is a good idea