Virgin Nigeria/air Nigeria
Correct! they hire low timers.
The Visa question is just a convenience thing for recurrency training.It will be arranged for you if you do not have it.
I doubt if they will give you a type if you are not Nigerian.They did so in the past and most of the guys ran to other airlines e.g Arik when air nigeria had financial problems early this year.(late salaries etc)
However if you are willing to finance the type they will employ you if you pass the selection process.
They are in need of crew.