You need someone on your team who will take on a leadership role.  The team leader typically does the following:

1. Schedules work sessions
2. Makes assignments
3. Follows up to make sure work is done
4. Talks with non performing team members
5. Facilitates team work sessions

When you select a team leader, you want someone who is very strong willed and not afraid to have other team members mad at him/her.  Selecting a friend as a team leader may not be your best choice.

The best approach for selecting a team leader is to see who wants to be the leader.  An effective team leader will not be bashful about wanting to assume this position.

Should there may be 2 or more students who want to be team leaders, ask each of them to speak about why they would be a good team leader.

The team should then do a paper vote for the team leader..