What do I need to start making custom AI again?

I’ve already made a working set of classes that I was using in UDK 3 to create an RPG. I have Unreal 4 and Visual Studio 2013 and the code from Git Hub. All I would like to do, is to transfer this over to start working with it again.

Do I need to add to the Unreal Engines’ editor code (i.e. the code from Git Hub) to do this or can I start a new project in Visual Studio, if so how would I do so?