Hummm, Here is how it goes: Mossi designate a person or the tribe, and moree is the spoken language of a mossi person or the tribe.
i do speak morée, but it is not essential to live in the country. Do not forget that moree is only one of the 60+ languages in Burkina faso.
Now when you go to villages, thats when it gets kinky and your problem will not be moree alone.
Cities are where you should definitely live, because people tend to speak french, the colonial gift.
Now when it comes to learning the language it self, i will suggest talking to your embassy or consulate.
Or you can also try the big old Youtube. I found this one that gives the basics
here is a burkina faso news site
Let me know