Project management skills are primarily about interpersonal relations and communication. In order for a group to work effectively, it's important that all members understand their collective and individual tasks. Often, when groups are inefficient, it is because they have not communicated well with one another. Try getting your group together to create a list of your goals for the project as a team. From this end goal, you can create "steps" along the way that each of you can take individually to get you to that goal.