Linux-based afternoon

Great.. at last I found an afternoon with nothing to study for tomorrow and nothing to do.. so at 2pm I said: "come on, let's start doing something interesting"... a few minutes later I was in front of my monitor studying how LVM works.. it's great! Just what I was searching for my notebook. Yeah.. infact I was thinking in tha last days how to devide my hard disk for Gentoo Linux.. I heard some time ago about LVM (Logical Volume Management) and his characteristics. But I want to do something different... I want to set the / partition as a LVM logical partition, but for this issue I must use an initrd kernel. Well I have a little problem .. I don't know how to create and manage an initrd kernel :-) .. so let's start studying this before trying to do anything else with LVM.