Have you checked all the editing links?
Most of what applies for 2k3 should be useful for 2k4, because the basics haven't really changed.
Anyway, your best bet is to wander over to UDN, start here, and work through. The intro there is helpful. There really isn't a better set of tutorials than those at UDN. Cover all those and you'll be well on the way.
Also, this looks good. It's all there in the list of links