Arduino Nes controller, Please Help!

Craftee:
im just a kid that needs help, gosh!

If you think you are capable of solving this problem already with a little help, then you ought to be at least part way there on your own. Show us where you've got so far and which part you need help with, and no doubt there will be plenty of people willing to steer you round the problem.

If you simply don't know where to start, then put this project down and start with something simpler. It's best not to try to boil the ocean - learn things one step at a time.