Disney must get approval for sale of the particular timeshare in each state before it can sell in that state. Some take longer than others to approve, but once your state has approved, sale process is virtually the same as being there except for the time spent using the mail. You call and say you want to buy. You tehn send deposit check. Once they have it they send out all the papers to be signed (usually arrives in less than a week), you sign and have notarized (you will need to find a notary) and return in two-day mail delivery envelope provided. Whole process takes 10 to 14 days.
You cannot purchase there and stay there at the same time on points (unless by chance something was immediately available right after you purchase). Moreover, if you have and are using a cash ressie when you buy there, they will not give any credit to void that ressie.
Also, be aware of what usually happens for new buyers. If you have a particular time you want to go after you buy and you tell your sales rep at time of purchase, you are virtually certain to get what you want as they seem to be able to do that for new buyers.