1-1s are probably your most valuable tool. Often, you will discover problems and info you would have otherwise not known - "our lead developer seems depressed and was talking about quitting", "did you hear about that other project that started? It's in direct conflict with our plans...", "there's a conference coming up, we should present at it", and so forth.
An effective manager should, in my opinion, spend 50% or more of his time with his team. Working on the same topics, talking to them, helping to plan, fixing problems, finding resources, and doing 1-1s. It's no surprise that teams with the most problems often have a manager who is just not around enough.
For new managers, I always suggest the following resources as a great starting point:
- "Team Geek": http://shop.oreilly.com/product/0636920018025.do - "Managing Humans": http://www.amazon.com/Managing-Humans-Humorous-Software-Engi... - Manager Tools podcast: https://www.manager-tools.com