The only other thing I think is missing in this article (and fair enough, it's long, and you can't cover everything) - is about the expectations. One of the most difficult parts of making your way into the glorious role of Lower management is that you're generally in a new role, and so it's up to you, your subordinates, and your boss to define what is your role. Very often your boss was doing your role (as part of their larger role) previously and it'll be a transition to get them to a place where they're coming to you instead of directly to your team, and it's clear when people should be coming to you.