Hi there!
Here are a fews things you have to keep in mind:
-always have a reasonnable cash amount with you;euro and USD but never tell anybody ....
-never tell local people that you have a dead line as they will use it against you...
-they are not idiot they know the system and the clock is working for them
-time and ponctuality is an issue in africa ,best thing to do is to advise your owner or pax and accept it or your life will be a nightmare....Ex:airport can close in 5 min even if you have your start clearance as the president airplane has checked in the frequency....
-make sure you do have the overfly authorisation and keep a copy on board,always have a flight plan copy with you as the original might be lost...
-as much as you can try to subcontract fuel with a local company to speed up the process
It is just a start so if you need some more heads up let me know
PS: the rest is pur fun and i wish you will enjoy flying out there....most expat are very good people and will do their best to help you;very friendly people
Happy contrails