I want to know the details about this company "Delux Consulting Limited" location at Nigeria.?

I've got job offer from this company last week and I would like to ask you what you think about this company. I'm scared if this is just a scam and I will lost my money. For your information, they want me to pay around US$750 for the agreement and all the doent including immigration and more will be send to me directly via courier to my home. But I just think if this company just a liar to me.I'm so scared to take this oppurtunities but at the same time I really want this job because they pay me very expensive.