If you'd never gone, I would say you should get the UG and the Birnbaum book and start reading and taking notes. Maybe look at hotel info here and on allears.
If you have been before, it just might be a tad early to start planning. Can't book hotel or plane. Don't know what parks will have EMH (if that even exists then, which I doubt), can't book dining.
The only thing I'd do now is buy tickets, if you don't have an AP. ticket prices only go up.