As far as I remember, you need passports and copy of them, Residence permit books and copies of relevant pages, i.e. first page with photo and page showing expiry dates etc. If a married couple then a notorised translation of your marriage certificate. We also took our copies of our nufus forms (registration of address). If you look back on the extensive SGK threads on here you should be able to find more information. It's not difficult to do on your own. BTW are you aware that the SGK office has now relocated to 561 Sokak, round the road just past Zakkums going from Calis.