Some rookie questions

I haven't had a lot of experience in engine modifications and these questions will probably sound kind of stupid but I was wondering if you guys could help me out. I have a 3.7l /6 and I've been trying to think of some modification I can do to it to improve the performance. It is an automatic so I don't really know what I can do (if anything) to it. Starting out simple will be key to my education, so if you have any ideas i'd love to hear them. Thanks.

-Logan