You just need to call MS and see what may be available for the dates and location you are interested in travelling. If there is nothing immediately available you can request an ongoing search. This may be done without actually commiting any points immediately.
If you have points that you won't otherwise be able to use by a deadline, you can "bank" those into the World Passport Collection which extends their use by 2 years and then again use the ongoing search to try to find a destination.
MS will walk you thru the process. It is best to start the process as far ahead of the time you want to travel as possible. Some of the more popular locations may take up to a couple of years to secure a reservation.