for a Nigerian to work in Dubai he/she will need a residence visa, labour card and health card.This will allow you have a working stay of up to 2 years .They are two ways to get a residence visa
1)you will need to be sponsored either on the basis of the ownership of a business in the U. A. E
2)you will have employment contract with an employer in the U. A. E
for more information on how to get a long term visa for the U. A. E call/whatsapp Mr Peter on 08062695017