I do have a kill switch case ordered and have Chiari4deck and a deck video app downloaded but I feel a little over my skis with all the cool shit this thing can do and would appreciate a sherpa. Thanks in advance!
If you have the oled model. Try the ori will of wisp game. And enjoy the amazing hdr on offer.
For emulation look into emudeck. It’ll install everything u need to be able to emulate any console u need
Get the heroic games launcher from discover store, this will allow you to use ur free epic games they give away every week as well as gog and if u have Amazon prime, ur prime games too
Look into the decky loader. This will allow u to install custom plug-ins to customize ur interface. Just have a look around the decky store but some basic ones to start with would be
CSS Loader - will allow u to create a custom theme
Protondb - see community ratings for how well a game runs (helps with seeing if unverified games work)
Animation changer - change start up movie with a custom one from their page
Emudeck is nice if you were planning on emulators, other than that the main thing i actually use is the steamgriddb plugin for decky loader, makes it easy to fix all the broken artwork in game mode menus