I am learning from everyone but still not all the way there, yet. I am a visual learner and would really appreciate a hand drawn sketch with arrows showing the flow direction of electricity at each connection point. please clearly label polarity and other relevant points
Are you also asking about accessory activation wires? Those vary by each type of accessory. Are these all buildings? Otherwise, could you list the accessories you are trying to hook up?
Also, you asked about modular connections. There are great ways to use labeled Molex connectors so that you can unplug a module just like you would with a power cord to a wall outlet.