Hello, I am interested in photography, but don't have a lot of money to spend. I only have $200 available, and I really have no clue what to do. I would like a camera that has at least 7MP and has great detail. I was thinking of the Canon A570. I don't need to change lenses because I'm not at that level yet. Also, where can I find out what all the settings and terms mean such as ISO, Shutter Speed, etc?