I started using Linux every day in 1999 and I’m glad I did.
Managing a Linux server is no different from managing a Linux desktop. If you were to consider the GUI nothing more than a display layer over the top of a server, you’d have a good mental map of how things work.
To get started, use the same desktop distro as your server and use their preferred or default windowing system.
Once you’ve familiar with it and the pitfalls it comes with, you’ll know which questions to ask for your next choice, but you will be able to build on what you already know.
Wallpaper, yeah, there’s a lot of that going around. The main feature discussed with the recent new release of apt discussed colour as the primary new feature. No mention of any actual substantive changes or reference to the impact on apt-get et al., or even a link to the detailed change log.