if you have Dec 2022 points, they are good for any trip that occurs between Dec 1, 2022 and Nov 30, 2023. For any such trip, you could, if needed, also borrow points from the Dec 2023 use year, when making the reservation.
As to actually making the reservation, you can do that at 11-months out for home resort regardless of when your use year begins. Thus, today, Nov 12, 2022, you could book any trip that will occur in your Dec 1. 2022 to Nov 30, 2023 use year that starts on or before Oct 12, 2023. And your "current" use year points for that trip will be the Dec 2022 points, and you could also borrow points from the Dec 2023 use year when making the reservation.
As to planning your trip, be aware that BWV currently has a serious problem for getting reservations in Oct next year. Late Sep to marathon weekend in Jan is
DVC's high demand season for WDW DVC Resorts. BWV will be going through a renovation in 2023. As part of that renovation, the boardwalk view villas will be unavailable for time in the fall of 2023 -- thus far that time is from Sep 9 through Oct 19 (we learn daily when checking for reservations online if another day is added, i.e., we do not yet have an end date for the shut-down of the boardwalk view villas). The result of that absence of so many rooms has been members reserving, right at 11-months out, both standard and pool/garden-view rooms, particularly studios (and as a result also 2BRs since all two-bedrooms are lock-offs and if the studio is reserved the 2BR also disappears), and both are sufferriing from an 11-month issue, i.e., they may fill within nanoseconds at 8 a.m. eastern at exactly 11-months out.