I'm currently enrolled in a basic 35mm photography class. I have a Nikon N65 that I really don't know how to use. The instructor of the class is not very good, and I am having a difficult time understanding the basic principle of good photos: how do I know when I've correctly adjusted the shutter speed and/or f-stop? Does my camera give me an indication of when I need to adjust these things? What am I looking for? In other words, won't my camera allow me to take a picture no matter what shutter speed and/or f-stop I have selected? Am I supposed to be relying on the light meter? I am so confused!!