I'm 17, got my Level 1 just before I turned 16 and I have been coaching in an independent company for just over 2 years, working with kids between the ages of 4-8, mixed ability. I absolutely love it. Think the most important thing to coaching is having a connection with the kids. I've worked with a fella a few times who bangs on that he's going in for his Level 3 and UEFA whatever, and when he's taken sessions he hasn't got his point across to the kids at all. He did a passing/moving/spatial awareness session a couple of months ago and it just didn't work at all. 2 weeks ago I did the exact same session but improvised some progressions in of my own and it worked well, got excellent feedback as well from the kids, with the vast majority of them understood the importance of finding space and creating gaps for the teammates.
One thing I'm struggling with, however, is finding variety in my sessions. Most of the drills I know are dribbling, shooting, passing and heading. I could do with some other plans that are quite simple, but will be challenging for a few of the more advanced players.