Is there a tutorial you can recommend? Not long after it came out I managed to get it running, but only in desktop mode, and input wasn't working at all.
you will need to add Yuzu as a non steam game in desktop mode then you can find it in game mode on that tab. before launching any games at least for me I have to use the touchscreen to launch them at first.
As for input, check the controller settings then go to controller layouts and the community tab, some people have made layouts for it. you might have to experiment with different ones a bit till you find one you like though.
You could try steam rom manager. It allows you to add your roms and/or emulators to your steam list from one app. It comes with emudeck but I think you can get it separately if you don't want to use the rest of emudeck features.