Please don't allow anyone to deceive you about Dubai . If you want to go for vacation or business to buy goods and return then Dubai is good but if you want to go and look for job please don't try it.
There is no work permit again for Nigerians in Dubai use that money and open business in Nigeria and you will make it. Don't allow agent to scam you. Dubai visa is not more than 250k but agent will collect up to 500k and + airtiket you spend close to 1m. You will cry if you borrow money and do Dubai visa and reach the country and you discover that there is no job for Nigerians.
To whom brain is given sense is expected.