A generally "get fit" question.?

I'm overweight at the moment and Football conditioning has just begun. So, I'm doing that. I'm just curious as to what else I could do to get fit and look better. I think my life would take a huge positive turn if I just looked better. Even the girl I like told me "I know I should like you...I don't know why I don't" but personally, I know it is because of my physicality. Give me any workouts or diet plans or tips or anything that will get me fit and looking healthy and strong.