I am not sure if you can book more than a year in advance. But for a popular time like New Year's Eve, I'd get that ressie in stone ASAP. Sadly, since you're starting your stay during a peak time, the room price will be higher than if you arrived on 1/2/06 for example. Perhaps you should make the ressie for 12/31-1/2 right away, then book another one for the same resort starting 1/2 to get a better rate for the rest of your stay. Anyhow, I'd do the NYE ressie right away and maybe wait until the 10th to book the 1/2-1/9 dates. Also note that you are much more likely to get a code later on for the January dates than for the NYE weekend dates.
As the CM on the other end of the phone and tell them what you want to do. They can then facilitate the process and let you know how to get what you need. Good luck!