When you start any group assignment or project it is a good idea to agree on some basic organisation and how the group will work and communicate together.
Think about:
When to meet-pick times that everyone can make.
Where to meet-again,pick a place that is accessible to all group members. You may need to book rooms in advance.
How best to keep in touch-share emails and phone numbers and agree the easiest way to communicate. You might use a blog or wiki on blackboard.
A realistic schedule to complete your task.
The importance of being committed to the group,and turning up and participating.