Get a copy of Roger Hicks's book on Hollywood Portraiture -- it will tell you everything you need to know, right down to lighting diagrams for dozens of Hollywood publicity photos from the 1920s through the 1950s. Essential reading for the subject -- it is far and away the most useful book I've ever read on photographing people.
that is a great book!
mark wangerin's book should address this subject too ..
but it isn't out yet