I could show you how I have done a lot of what you are asking about, but it would be way to much for me to type it all out. I could make a video and talk you through what I have done, my system is set up for replication for multiplayer, I guess it will also work for single player games.
It would be a pretty long video, because that is a lot of information, but if you really want me to I might be willing to do it. Also I am only an amateur, so this might not be the exact proper way its supposed to be done, but it does work and is fully functional.