How to get started with AR?

Hey guys,

I'm doing a self-initiated project where I'm making some Pokemon games maps as 3D but I want them to be augmented reality and set them up in a room so you can move through the room and see the map.
The thing is I don't have any experience with AR and I have no clue how to start developing it. Can you guys give me any tips?

also feel free to ask anything about this as I know this probably seems confusing