Simply google for information on overclocking. It would take a VERY big post for someone to explain everything about it. Google "Overclocking guide", read about the basics.. get yourself more knowledgable on the subject, then come back and ask for some help when you REALLY need it.
The Newark core as listed above is one HELL of an overclockable CPU, a lot of people hit around 3ghz with it.
754 Venice would be interesting too though.
EDIT: To check the BIOS version simply look at the bootup screen.