I am an amateur photog and want to learn more about how to photograph and change aperature and f stop and all that good stuff but i know nothing about it and don't have time for school. Anyone know any good sites? One shot in praticular i want to get is a maternity shot close up of belly and light is to one side and sort of dark but when i try this it is blurry without my flash. Also, i have a Nikon D40 . Where can i learn more about when to use what aperture and shutter speed, also when i am either in P S A or M modes, even with the sb600 flash, my pictures are dark or blurry or just dont look right,,,,HELP!