You will need a visa to study in Cameroon.

You will need to wait and apply not more than three months prior to the start of the program, and you will require an acceptance letter from Middlebury as well as an enrollment letter from UCAC (both will be sent to you) before you can apply.

Applications forms and instructions are found on the Cameroonian Embassy's website: http://cameroonembassyusa.org/services.html#visa_consular 

The application form itself is fairly self-explanatory, except it bears mentioning that when you are asked for your mother’s name in foreign contexts, they want her maiden (not married) name.  Also, your profession is “student”; employer is your school.  Please pay attention to the specified date format.

You’ll need a reference in Cameroon, for which you should use our director:
Jeannette Ariane Ngabeu

And the only address you should reference is that of the university:
Universite Catholique de l'Afrique Centrale
Campus de Nkol-Bisson
Faculte de Sciences Sociales et de Gestion
PO BOX, 11 628
Yaoundé, Cameroon
tel. +(237) 22 33 74 00

If you haven’t yet gotten the yellow fever vaccine, plan to get that at a travel clinic or check with your doctor.  That appointment will be a good time for your health care provider to advise you about malarial prophylaxis as well.  Even though the consulate requires only a copy of the yellow WHO card that lists your vaccines, you must take the original yellow WHO card with you (keep it in your passport) and present it upon entrance to Cameroon.