Why does everybody suggest Ubuntu?
There are many different versions about, thyen. For the definitive linux site that may have a particular type suitable for you:
http://distrowatch.com/
It is usual for each distribution to be accompanied by a guide. Sometimes two. Download of such a guide will be free, usually.
__________________
Where there's a will, There's a way.
Pay developers, not Rapidshare!
I know nowt, but at least I'm trying.
Quality, not quantity.
Prevention is better than cure.