We had 7 days in Turkey Sept this year. Flew direct to Goreme, Cappadoccia (transit IST) with late arrival and not a better place to get over jetlag (the early morning wake ups made watching/ballooning a breeze). Did a tour here incl 1 of the underground cities- not so enamoured would have been better hiring a car and doing our own thing with hindsight.
After 3 nights flew from there to Izmir and picked up hire car- no issues driving straight to Selcuk with GPS. Went to Ephesus same afternoon (worth having a good guide at the site- many hotels can arrange- and also pay the extra for the terrace house section). Watch out for cruise tours in season. Drove next day to Aphrodisias (we loved it here and did the site on our own with lonely planet as our guide) then a quick visit to Pamukkale and drove back. Driving was easy, good multi lane highways, did need to watch for tractors etc and the speed idiots but our hotel recommended sticking to the speed limit due to speed traps and the whole keep right unless overtaking worked fine! Was a very long day though (3hrs drive each way from Pamukkale before sightseeing).
Back to Izmir and flight to IST. we had limited time in IST which was a failing if itinerary.
I'd been before but partner hadn't and this was a tasting plate of what Turkey can offer!
Don't be afraid of driving- will let you see the country more authentically but also the distances can be significant so flights are useful. We used TK, & Pegasus, no issues but worthwhile prebooking extra weight for check in if needed (there also was some flexibility then for an extra kg beyond that).
Turkey is a lovely country to travel and I hope you enjoy it!
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