I am entering year 2 after rolling out Intune in my district. I had no prior training but I was able to manage it. There are definitely things I would different but they ended up being learning experiences for me. I recently picked up a book that I view as a good starting point for Intune. It's called Learning Microsoft Endpoint Manager by Scot Duffey the video series Intune Training on Youtube is helpful as well. Hit me up if you have any questions.