Im trying to load a map in Sp with npcs in certain places. How is this done? Plus how do u load a another custom map after the one you just finished in sequence? Basicly trying to overwrite the game with new sp maps & npcs coverting it to a whole new game. I just need to know what direction to start in. What text needs to be edited & how to load the maps in sequence with npcs popping up wherever i want them?

Well, that's not something that's supported by the game by default. You'd have to code that feature into the game.