I am new to model railroading. I am building a 9x10 around the room layout in N scale. I want to convert all my rolling stock to Micro Train couplers. The problem is that I have no idea which ones to get. Do I need to buy the trucks and couplers together? If so, which trucks. I model modern day equipment. I notice all sorts of different types of trucks and couplers. Can someone give me some insight?