A little info on the parts that I know:
There's no fuel in Lokichoggio anymore, the fuel supplier pulled out last year. Same goes for Eldoret. Nearest fuel is Nairobi when heading south into Kenya. ATC at Loki are very friendly however. I'd seriously avoid flying into S.Sudan - Infrastructure is minimal and airfields aren't set up for visitors. You can find Wx (TAF/METAR) online for the major international airports but don't expect it for small regional airports like you get in Europe. You can get satellite rain radar images online which can help for planning but aren't up to date enough to help in flight. Make sure you brush up on Tropical weather, especially the movement of the ITCZ as you'll be passing through it at some point.
Cheers,
F4C
The AIS claims that there is JetA1 in Mandera. Any truth in that?