Q: "I was just promoted to be a manager over a problem team. Where do I start?"
A: Initially, you need to become more familiar with the situation before just going in and changing things. If you start by arbitrarily changing policies or procedures, you may only be treating the symptoms of a bigger problem.
Take time to track and analyze problems that you find. Be very specific with what they are and who is involved. This will help you avoid unnecessary changes or even layoffs. Get to know the employees better. When it comes time to make changes, they will respect your decisions more.