In many ways, succeeding as a manager requires similar focus and dedication as you required when you were a developer. Most of all, it is the lifelong-learning mindset and attitude that really stands out and underpins all of the skills you acquire throughout your career and developmental journey. That's why it is so important to invest in yourself, as much as you invest in your team.
Understanding the 70/20/10 blended learning model is certainly a start. This is where 70% of all learning is typically experiential, achieved through doing. The other 20% is exposure, achieved through asking, with the remaining 10% being educational, achieved through studying.
Although your background and most likely focus will be on delivering software projects, you do need to also understand the operations world. Specifically, what the ITIL framework for IT Service Management defines...