Being a Manager is a hard job; Being an Agile Manager is even harder. In most cases, you'll have reprogram your management style to suit the 'self-organizing team' concept of Agile.
First thing I would recommend an Agile Manager to do is to familiarize yourself with the Agile Concepts, Practives and Values. Educate yourself through a rich knowledge base of Agile
Agile Management is servant-leadership
The Performance Goals for a Team
Article on the role of the Agile Project Manager
Website with several topics on self-managed and self-directed teams
Do you think your Agile adoption could fail to endure? Check for these risks and symptoms.
Symptoms of Agile adoption headed for failure
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