There's quite a lot of questions already asked on this, one of the most useful threads I found was this one ...
http://www.pprune.org/african-aviati...ial-guide.html
That one is on Botswana, although a lot of the African countries that bush pilots fly in differ to each other, they have a lot in common, so this is a good start point.
Read up on it and then do some searching on the forum.
Hope that helps!