This is an opinionated guide, hopefully nobody gets the wrong idea like it's actually hard to start using Wayland - for me, switching to Wayland was one drop-down menu option that automatically appeared on my login screen.
For example, getting Wayland to work with Plasma on Nvidia graphics cards is still a nightmare, despite it being officially supported. Out of the box, starting a Wayland session just knocks the user into a frozen TTY. Once you get it to work, you quickly learn that hardware acceleration for X11 apps is nonexistent, rendering most video games unplayable.
On what distro?
For i3 -> sway it's not as easy but also not very complicated, nor time-consuming
I would have guessed the GDM/login manager is X11/xorg?
For the open source Radeon drivers you have to specifically enable early kms, but I imagine that's done for you with most distributions.
Really, this stuff just works if your hardware is well supported (i.e. - not nvidia).