You should check out the youtube videos posted by the Robogamers. The channel is RobogamersTV
https://www.youtube.com/user/robogamersonline
Watching their videos helped us a lot. They have one specifically on joystick control programming.
https://www.youtube.com/watch?v=3HF31q2mnfA
The Anderson wiring will probably help as well.
https://www.youtube.com/watch?v=M1FsxbLcM0w
Hope this helps.