Welcome, Richard!
I refuse to call anyone clueless who at least knows what they don’t know and is willing to receive instruction! Don’t be so hard on yourself. Like you, I always had very simple RVs (like our Scamp). Then I acquired a hand-me-down Class B. Talk about complicated! Still learning.
This forum is actually about molded
fiberglass trailers, so you may find a shortage of specific technical knowledge of how your slide-in camper is laid out. But the basic construction and systems are similar, so you should be able to get general information about operating and troubleshooting RV systems to get you started.
Best wishes!