Good Idea
I am days away from my CPL test in SA and am amazed at the number of Nigerians currently enrolled in flying schools in South Africa. Starting a flying school has always been my dream and I have been doing some research along those lines.
I believe one of the major problems one would encounter in Nigeria is bureaucracy as the school would be in competition with NCATZ and also avgas as mentioned earlier.
Ghana will be a good option as they will be open to investment and English is the official language.