I normally take out £50 in Turkish money to get me over the first day, the rest I take in a mixture of £20-£10-£5 notes.
Myselfe I change my money in my local bar,always got a better rate than banks etc.
Buying in the markets and paying for trips I use stirling as everyone accepts it.
make sure as non of your notes are soiled or have tears in them as they will not be accepted.
Credit cards can be used in some shops and restaurents and also getting money from the cash machines.
Keep all your money passports etc safe,by using the safe facility at your
hotel or apart.
Gene