So I got ahold of my father's 35 mm. Canon T50. It seems like a good camera to learn on. I have decided to learn how to really use the thing rather than just point and shoot. My question is, when beginning to experiment with aperture and shutter, where do I start? Lets say I go out on an overcast day (its overcast here today) and I want to shoot some pictures over a bay. How do I know what to set the shutter speeds and f stops at? Is there a general rule or basic rulings for different lighting settings? For overcast days, its better to use a lower f-stop ratio like f/8 and set the shutter speed faster to compensate like 1/250 or something like that? I'm sort of pulling these numbers out of thin air and don't know much, but I've been reading a lot of literature about it and I want to get going, but don't want to just go about it 100% aimlessly. Any help?