Google has a fantastic resource for managers but it's a lot of material. Fortunately Ravi Shankar Rajan wrote a summary of one of their research projects.
The most important activity for management success is being a good coach. Successful managers know how to coach their teams into success. — Ravi Shankar Rajan
He goes on to highlight 4 roles you can take on: Guide, Empowerer, Director, Catalyst. His practical tips are quite good, so we recommend you check out the full article.