The number of points required depends on the view nd the season. You'll need to be a little more specific to get a good answer.
As an example, a standard view room in mid-summer 2005 is 49 points per night. A Conceirge room (CA Theme Park view) is 88 points per night during the same time and there are several options in between.
There is no additional charge beyond the points to trade your points for one of the resorts in The Disney Collection.
Best wishes -