777 will be the chosen one to do all the night turns as the A330 and A340 aircraft go. Most of the US will shortly become A380 as is the case in Australia.
I would certainly not count on getting 15 days off a month. The minimum is 8 days to recover and welcome to an airline that is good at running a fatigue programme that would not be allowed in other countries.
29k AED is a good salary for a single person but, you will find it rather expensive here and your salary will not be as good as you think as it will not stretch as far as it would in your homeland.
777 command, 7 years as as good a guess as any (for today).
Most crew are professional and friendly, you will rarely fly with the same crew member in a year.