First of all, the area is called Madinat Khalifa - not Medina. This is on your right side when you are going from Doha. You can find the signs well before reaching this point. They open in the morning, and in the evening after 4.00 pm to 7.00 pm. Please carry all the necessary documents along with you, like photocopies, photographs etc - you may not find these services over there if you look for in urgency. Photograph should be on coloured back ground (preferably on blue). Also dont forget to carry your ATM Card - all the payments are done through ATM Card only - Cash not accepted. Good luck