If you read the member information you got when you joined, you will discover that most exchanges will take a minimum of 160 points, so you might need to borrow from your next use year to make an exchange. Basically, you give MS a range of places and times of year you are interested in, and they tell you when they have an exchange that matches your needs.
We have exchanged to Hawaii, and left our search very open ended. We gave a 6 month window and said we would accept any resort on any island except Oahu. We started our search 2 years out, and got our exchange in 1 week. It made it easy to make the rest of our Hawaii vacation plans, because we were waiting for another timeshare exchange too, and that way we could search for a week either side of our DVC exchange.