I read information and very confuse at the moment . Can someone please clarify

After arrival ( from international fly) and clear immigration and X-Ray of my luggage, I will exit the door, passing thru the crowded area ( with people waiting outside) , I will turn right and go all the way to the end of corner of building. I will see many taxi in cue, waiting for their turn . I just pass by them and go until I see Vina sun or Mai Linh taxi . The Mai Linh or Vina sun representative will give me a voucher with number on it. Here is my question

1) IS the number written on the voucher taxi license number ? Not sure how to find the correct taxi to board . Please clarify

2) Do I pay have to pay upfront before getting the taxi voucher

3) I was told, if I can not find Mai Linh or Vina Sun taxi. I can go to the departure area and catch a taxi from there. Please point out if where is the departure. Is it in the same terminal of international building?

4) Does any one has a link of Tan Son Nhat airport map to shows where is taxi counter for Domestic terminal and international terminal

This is out first trip and we heard many story of taxi scam in Vietnam, so I like to learn all information before our trip .

Thank you