Count Me in!
I'd be up for helping newer players with teams that I am familiar with! I've done some basic coaching before so I would have an idea of how to organize a session.
Approach - I would work on teaching the importance of having a plan, understanding your team, your opponents team, and what you want to achieve in a drive, and when you want to achieve it.
Teams - I would be up for coaching players on the following teams: Nurgle/Chaos/Chorfs. Pro elves/High Elves/Wood elves.
Coaching method - I would probably want to look at a players match stats and see if anything stands out. Then maybe theory craft a few offensive and defensive plans, and maybe review a match or play a practice match.