install templates

Hello,
I am lost. I can’t really find a doc that tells me , a dummy how to install some of the templates or skins or whatever they are to be called, I have found. Mostly from the Alex King site (hope I remembered the name right).
I d/l them. No readmes. Most are in subdirs like rubik or newspaper . Were do they go ?
THere is no wp-layout.css in them ?
So confused.
Any help greatly appreciated.
DUmmy