Lots more information is needed... How far do you want to OC? Do you have a stock cooler? and someone most likely will not go through the trouble of finding exact voltages and freq's for you, you'll need a ballpark. Get googlin' and read!
Don't know how accurate this is, but it should apply to your E8200 too:http://www.tomshardware.com/forum/240001-29-howto-overclock-quads-duals-guide
Might be a good start.