Learn Java?
That like saying that you wanna drive a car except you dont have a license or previous experience and expect us to tell you from the internet
Send guesstimated packets, among a million other things. No offense, but they're not going to let some punk kid just hack their game - and this "hacking" you refer to is firstly illegal, but more importantly, would take extensive knowledge in the coding world. You can stare at a Java book for a couple years and not have the slightest idea where to start.