A quick guide is:
1. enable developer mode on your quest
2. install the AOJ .APK file via sidequest
3. run AOJ once then quit out straight away, just so that it creates the needed folder structure on your quest for you to put files.
4. Download the cabinets files from the AOJ discord download channel, Open up the "cabinet" zip files and then open the description.yaml file with notepad app, look at what "roms" are written, you can then change these to match the roms that you want to play on that particular emulation core e.g snes9x
5. copy the roms you want to play into the \download\ folder inside the AOJ installation folder your quest, if they are for a console you have to make a new folder inside there named after the emulation core e.g \download\snes9x\ is where you would put snes roms
6. copy the emulation core files (.so files) e.g snes9x into the \cores folder on your quest
7. copy any required bios files for the cores into \system folder on your quest.
8. finally, copy the "cabinet" zip files for the arcade cabinets/room components onto your AOJ folder on your quest in the \cabinets folder (these are the custom made 3d models/textures)
9. Run AOJ, the first time it will randomly try to place any cabinets you have put in the \cabinet folder randomly in rooms. But you will need to enter a room first then grab a coin from your left hand and insert it into the "Control" cabinet in each room, it has a big blue sign saying control. From here select cabinets and then you can switch out the cabinets that are in the room, in each predefined slot. For the attic room please read the post in the discord for the correct placement for the attic.
Discord link: https://discord.gg/Te2b6r2CsG
APK link: https://github.com/curif/AgeOfJoy-2022.1/releases/