I agree with what Flat Cap says.
1) There are already more than enough F/O's in flydubai to fill the LHS of the all aircraft still to be delivered - based on the original order of 50 aircraft made at Farnborough in 2008.
Unless flydubai order more aircraft, or unless a lot of Captains quit, any F/O who joins flydubai today will almost certainly wait many, many, many years for a slot to become available in the LHS.
2) Some are, some are not.
3) An Emirates F/O earns nearly as much as flydubai Captain. The total package at Emirates is far superior to that in flydubai.
4) Almost certainly impossible!
You could perhaps try bidding for 1 week of leave every 2 months, but there is no guarantee that you would get it.
The most you can expect from the roster is perhaps a few groups of 3 consecutive days-off spread throughout the month, though usually surrounded by duties with a late finish and early start.