I am going to take a trip from Sydney (SYD) to Yerevan (EVN) via Dubai (DXB). The first part of the flight is with Emirates (EK), the second part with Fly Dubai (FZ). In Dubai airport I should change terminals between 3 to 2. I would like to know how I can reach Terminal 2 from Terminal 3. And do I need a visa if I am not going to leave the airport?