How to I Madden football better?

How do I sharpen my skills at playing Madden football on any game system including a PlayStation Portable (PSP). I played madden when I was little but I wasn't good at it. Most of the time, I didn't know which play to choose because I was afraid of making a fumble or being intercepted by the opposing team. I wish there was a way to understand how football is played because that's what I think about when I'm playing.