2011 when I got to be a test manager for the first time, there was one thing what helped me to overcome my beginner insecurity. It was the book by Judy McKay “Managing the Test People“.
Judy calls test team a perfect beast and all book is build around this perfect beast. How to create perfect beast (team building), how to find parts for perfect beast (job descriptions and interviews), how to fit the beast into the herd (test people working for projects), how to feed your beast (all kind of bonuses) and to keep it effective (manager needs to work for the team). I like the chapter about synergy and pride.
I found this book very easy to read. Maybe because I really like to compare a test team to a perfect beast. Over the years many Judy stories became my stories. Have fun to read it!