Would you please tell me how can I

1 Create an Auto generate ID number

- Using the Country, the Year, month, and order 

VN 1603002

VN > Country relate to list choice field

16 > Year 2016 choose in the date filed

03 > March - from the date field

002 > the 2nd booking in that month

2. Would it be possible to make it shown while entering data or at list shown in the auto text appear after I hit "Submit" button.

Thank you sooooo so much in advance

:D