Hi,
Check out this guide, it's great for someone that's new to overclocking: http://www.techrepublic.com/article/overclocking-guide-for-intel-celeron-and-p4-processors/
There are plenty of other guides out there that will help you, I recommend you read up on overclocking your CPU being trying to overclock at all as it can damage or even kill your CPU if done incorrectly.