Read also Horizons Unlimited forum for info on North Africa and ferries, also visas for Ethiopia,Sudan and Egypt. Fuel all the way to Kenya is not an issue, you should have a tent- though central Africa has many small and cheap guest house, change money at ATM/bank/bureau where possible, be very wary of changing currency at border posts with touts. Don't overplan and smell the bushes! If you pass through Tanzania, drop me a pm...