Katjuscha dont worry about your passport and residence visa.Basically Emirates is your sponser and they provide the residence visa which enables you to stay in Dubai.You will give your passport to Emirates probably during the first week of training school and will then have to complete the residence reqirements ie HIV blood test. When the results of this are known your passport will have a residency visa valid for 3 years put in it and you will be given back your passport. Emirates takes care of everthing so dont worry. Every 3 years a new blood test is untaken and another residency visa will be issued.