Here is a Christian Coptic Mission that is present in a few countries in Africa that I particularry like and that I may be joining for this summer if everything goes well. I encourrage you all to take a look at it and if interests you to fill and send the application form in order to go help out by serving.
Churches in the mission: http://copticmission.org/copticmission
Service opportunity: http://copticmission.org/serviceopp
How to prepare for the mission: http://copticmission.org/preparing