Newby and Nigeria! Help more than welcomed!

Hi all, I'm a complete newcomer to all this, so please be a little patient if mess anything up!! And any advice is welcome!! Right then, I'm 23 and have been offered a job working in Nigria in Port Harcourt. The working pattern for me will be three months there, and three weeks home. I will be living on my own (where, I haven't been told yet). I haven't signed anything yet. All I'm after at the minute is advice on anything that you could recommend, i.e. vehicle type/condition (I will get one provided but is it worth blending in with something oldish or having a heavy duty 4x4), ideal places to live, such as recomended areas, neighbourhoods and such. (I will also be provided with a flat apparently, the details of which I have to discuss) where to bank, local to Nigeria and foreign. Things like the safest, possibly online. security, will I need anything in particular. Places to shop, like supermarket chains, places not to go VISAs, I haven't got a clue, but apparently it's been provided. I know there's a lot I've missed. I've also had a quick look at meeting (local) people, respecting elders etc wich seems pretty clear, and other bits and bobs I know I need all the injections which apparently take a month, and to keep off the streets after dark/10pm or avoid all travel unless necessary but if there are any points you would like to stress, I'm all ears! Thanks in advance!!!