This may be a stupid question but is your video cable plugged into the gpu or into the motherboard?
In your case I would just start by copying a full setup someone else made and then customizing it, starting from scratch always takes a lot of effort. Reddit’s unixporn was great for that, the alternatives on lemmy are sadly still a little empty.
Someone needs to maintain them for them to keep working. Nobody else is willing to do that anymore, but you can still volunteer as a maintainer. If you don’t, it’s as much your fault as anyone elses.
If you let it run through once, it should cache the compiled shaders so it will recompile only after the game or your gpu drivers are updated
What do you need RDP for? I did everything i ever needed to do remotely via SSH (I mean this as a genuine question, not that we shouldn’t have better RDP support)
Have a look at https://matrix.org
But be careful, you can pretty easily break stuff by messing up fstab