pelinayan
ok. I will give you some web adresses for bus transportation.
You can go wherever you want by them.
They are both of th biggest bus transportation companies of Turkey. ( Safety and quality. ) ULUSOY and VARAN
Also, taxies, shuttles for Istanbul Airport. Taxies are a little bit expensive. But not that much. You can use shuttle from airport to Istanbul city center. ( Taksim, Atakoy etc.) Click here
Let me give another alternative transportation >>seabuses. They are very fast.
I hope you will enyoj here.
Best regards
Pelin