For a step by step guide, I'll suggest using your favorite search engine and do a search for overclocking on your motherboard. Each manufacturer has different terms they use for the same thing so by using a guide directed toward your motherboard, confusion should be minimized. Also, any numbers they show should be considered a goal or "guidance toward number" since there are far too many variables (even with identical hardware) to guarantee success. Last, don't just follow the first guide you find, read through a few, it will help give you an understanding of what changes can have an effect on what. Most importantly, one of them will be easier to understand and follow than the others, you should be comfortable with the guide you choose.
Hope it helps