Congratulations with your upcoming DVC purchase.
Savanna View rooms are reasonably easy to book even for non-AKV owners.
AKV Club Level rooms are extremely difficult to book. There are only a few and they go quickly. They pretty much have to be booked right at the 11-month window. For example, I could not find any Studio availability for the months of November, December, or January, and 1-Bedroom Villa availability beginning only on January 1.
Point usage gets complicated because of "banking" and "borrowing", but let's set this aside for a moment to answer your question:
"Also, if my use year is December can I pre-use my points by booking a stay in December of that year?"
December can be confusing to explain because your "December 2015" points are your points for 1 month in 2015 and 11 months in 2016. You can use your "December 2015" points to book a December 2015 vacation.
Returning to "banking", you could bank your "December 2014" points and book a December 2015 vacation.
Alternatively, you could "borrow" your "December 2016" points and book a December 2015 vacation.
Hope that helps.