Hello!
I would advice you to stick in your original idea, IT, but I have an advice for you! You can start up a business, but it will take time for you to get to the Market, but it all depends with what you want!
I have my blood brother, he is making softwares and he has his PhD in these things from Sweden, he has been a goverment worker for about: 12 years, and he thinks of opening his company!
Well, I have an idea, don't think of doing this business when you are there, find a way, come over, find a place stay for abour 3/6 months, see what is happening and then you will make up your minds, this is my idea!
Staying in Arusha is not that expensive, its about U$D200 per month, big and good house, don't worry about that, and then come over and see what is happening! My cellphine number is: +255713520162, just incase.
Thanks!