Being an A330 F/O is not an easy job to do in THY. Especially about elder captains. I can handle it just because i am Turkish and i am very used to such kind of behaviors of elders in my country. But it'll not be so easy for an expat.
the salary is about 20k Turkish liras. equals to almost 5K $.
Layover periods and hotels are good except india and africa destinations.
its not stable, unfortunately, to talk about an average. average is 50-60 winter time, 70-90 summer time. ( but for this summer they are talking about +90 due to pilot shortage.)
Nobody cares about you, you are just an id number and slave. Don't talk don't complain just fly as much as your physiology let you.
Are you sure about having Turkish nationality?? which has nothing to do in almost %95 countries in world except Arabian peninsula!
as a conclusion, go to somewhere else.. ( which i will do also )
regards.