Some sage advice: If you can find a better, or even crappier, job someplace else, take it.
Nigeria is crooked. Carry cash. Do not use your own credit card for anything. Not even brand name hotels. Nigeria is #1 in the world for CC fraud. your CC number will be working hard without you even before you finish signing the reciept.
Don't drive after dark, Always verify who your driver is before you get into the van to the airport. Insist on operable door locks, watch them and make sure they do.
If staying at a hotel, a common scam is to get a call from an airport "representative" telling you that your report time or van time has changed. Usually comes early in the morning. When checking out of a hotel or paying your tab, count your change.
Take the old adage "Trust but verify", change it to "Question everything, and verify twice" and you'll be fine.
When flying, keep your eyes peeled and check the TCAS often. Aviation in Nigeria seems to be rapidly outgrowing it's infrastructure.
I am using Lagos as an example. More than 3 on the freq and the controllers can rapidly lose control of the airspace. Particularly Lagos Radar 124.7.
On the other hand, it beats the same old domestic milk run day after day. Good luck!
P.S. Don't dreenk zee water!