First of all your employer will provide you everything even some of company's have policy once candidate join company they will give some food allowance in adv or even thought not for extra expenses u can bring money convert in to dollors or Qatari riyal if it is available if not dollor is the currency u can bring again come exchange it in to the exchange centre in riyal. Just calculate as per your need how much will be exp for ur daily other than food an accomodation that u can convert in to dollors 500-1000$ might b enough to join stage this is what i suggest u