Google will show you the way better than anything else. Just search "Overclocking 3570k" and you'll learn a LOT. Also search up "Overclocking Ivy Bridge Processors". Also look up the specifics of your processor by searching for "Ark Intel 3570k". Just some friendly advice there. The more you learn and can "know" how to do before doing, the better.
So, Read read read, and read some more.