What I did is just take lots of pictures. Last winter I took about 100 pictures of Lacey every two days and once I was done editing/deleting blurry ones etc (I recommend Picasa, it's pretty simple to use and its free!) I'd generally end up with only 20 "keepers". And yknow, by the spring, after taking thousands of pictures, I was actually not half bad at taking pictures.
I'm sure I could take better pictures if I had a better camera but with the limitations I have, the pictures I can take most of the time end up looking like they weren't taken with my camera.
Does your school have a photo class? I've really benefited from taking photo classes.
Anyway, play around with your camera, try crazy stuff with it, get creative. One of my photo teachers told me that even though he is a pro photographer, it still can take him upwards of 50 shots to get one really outstanding picture. Therefore, imo, the worst thing you can do is not take enough pictures. Once you've taken enough pictures, you start getting a feel for it but to begin with, it's totally normal to feel like a fish out of water!
Fabio - 13 year old Arab/QH gelding
Hazel - 14 year old Angora goat
Atticus - 4 year old LaMancha/Alpine cross goat
Rest peacefully, Lacey.