Information on the first week of the expedition at Opwall's Madagascar page (though disregard the diving information re. the second week).
The full Opwall 'Schools Booklet' (.pdf) linked to on the above page gives specific details on the structure and conservation aims of week 1 (disregard any diving information).
Kit list for Madagascar (n.b. this is for the Opwall section of the expedition, and that you should - again - ignore any information on marine equipment. We will provide further instruction on kit in the coming months).
Details of vaccinations needed for Madagascar, which you should arrange through your own GP (from Opwall).