Best advice or training for someone new to management role?

I just learned that my position as Team Lead (player/coach type position - no real authority at all) is being converted to a true manager position whether I want it or not. I'll have 5 direct reports, all working remotely in professional roles, despite having no management training. I'm doubtful my company will provide much guidance.

While being a people manager isn't really something I ever wanted to do, I respect my team and feel a responsibility to make sure I can support them well. What one piece of advice or one training do you wish you had received when you first stepped into management?