You don't have to disc it, but you should get a nice cover crop in for the winter to build the soil. The more seeds in the blend, the better. Here, this video explains it in detail:
Some brassicas, some chicory, some clover, there are a lot of things that can grow over the Delaware winter. Then next spring you can think about what types of fruit trees and permanent crops can go in. That will give you all winter to plan, which some of us consider the fun part.
