Ask HN: Aids to Learn Engineering Management

I was recently promoted to be the head of a fifteen person engineering group that has multiple projects going on, some of them very blue sky research and some of them hardcore spaceflight engineering design.

I suck at it. I'm getting increasingly over my head. So I'm looking for help. Can anyone recommend a book, or a course, or a website, or anything that would give a completely new manager a life preserver?