Have you seen this? https://github.com/nobiot/Zero-to-Emacs-and-Org-roam It's still a work-in-progress but it may be along the lines of what you're looking for.

Personally, I wouldn't recommend setting up org-roam at first. It's excellent, but it's just going to be too daunting for a beginner when combined with all the other things. I'd start by just learning emacs and org-mode. Core org-mode has enough functionality built-in to start building knowledgebases, and the org-mode manual is excellent. You can add-in org-roam later. (And you might find that org-roam is overkill and something like howm mode to get backlinks is enough.) The beauty of emacs is that you can move your notes from one system to another easily.