If you are "confused about this FSB thing" overclocking is NOT in your future.
If you are SERIOUS about overclocking, yo'd be out doing your own research about it, so you wouldn't be asking basic questions in the wrong way on a technical help forum.
FYI: CPU FSB and Memory Speed ARE NOT THE SAME. They are seperate setting your your BIOS that, depending on motherboard, are not always related.
RAWR!