Your newly-formed work group needs to learn how to be a team. Just because you put a group of people together does not mean they are a team. Spend time together. Create opportunities for social and recreational opportunities so people can relax together. It is important to establish avenues of communication from you to the team, from the team to you, and among team members.
Communication is a word that is often thrown about when talking about group dynamics.
Unfortunately, many people only pay the concept lip service. It cannot be overemphasized. You must be able to communicate with your team and they must be able to come to you. That is why it is vital to create systems for both positive reinforcement and developmental feedback and insure a consistent recognition of team achievements. So, the team is now in place.