Ok, I just purchased a Nikon D90 and I received alot of good advice about lens, so I am thinking about purchasing the 50mm 1.4 lens and will later get the 18-200 VR lens. Is there a photography guide for dummies out there or something?? Anyway, I want to take mainly portrait shots (inside and outside) of children, families, models, music artists, etc..... So, what else will I be needing besides the camera and the lens? I've seen people mentioning about flash and zooms and telephotos and other things..... and also need help with lighting equipment?