What type of employment package should I expect for job offers in Luanda?

I am being offered a Financial Controller profile by a company in Luanda. I am a CA from India and have about 15 years of post qualification experience with big MNC's in India. Some couple of hours research tells me that the package should include housing, food , a car, health insurance and one trip to home country every year. 

That I am being given. My question to all friends who are in the know is " How much USD should one ask for as a saving. I am told this will be deposited in my account in the home country by the company every month". 

Another question is " Do the companies that employ you take your passport"? I am told it is a practice in some countries. 

Thanks a ton and God Bless