There is a lot of useful information on the Strobist site: http://strobist.blogspot.com/2006/02...-strobist.html

Some of it is limited to digital cameras, but most of it will work fine with any camera.

It is a bit cultish at times, and can certainly be overly complex for a beginner at times, but you might find that it gives you a flavour of what techniques are available.