There ultimately will be 4 roles, once the site is fully functional. In our current beta phase, we have the "Users" and "Mission Groups" in place now.
User's - Primarily the people whom will use the site to help get involved with Christian Missions. A user can start a Mission group and then becomes the group leader.
Mission Groups - The primary focus of our website. This is where you will build a "Mission Page" and then users can join the group with your permission.
Missionary Support Organizations - Those Christian non-profits whom primary focus is to support Missionaries.
Church's - The local Christian Church