I just picked up a sweet 40d canon slr and could really use some help and advice in using it to get the best pictures possible in a few situations. I work for a high school so I have to cover lots of sports, and our big things are football, volleyball and basketball. Football is played at night under stadium lights and the others are in the gym. What settings will help me stay focused and keep my image still and sharp instead of blurry. I'm not a newbie, but I feel like if you pretend I am no details will be lost. Any and all advice is helpful.