DIY scene manager

ok i am just getting started with UE4 so far i like it alot but i am looking for a way to make my own world system.
were should i start looking for were i can make it plugin to the engine.

-Ian

https://wiki.unrealengine.com/An_Introduction_to_UE4_Plugins

https://docs.unrealengine.com/latest/INT/Programming/Plugins/index.html