For general information about Turkey, it's hard to beat http://www.turkeytravelplanner.com I can't comment on Capadocia, as I haven't been there. But Ephesus is easy to do in 2 days with an overnight. 1. Book a flight from IST to ADB (Izmir) on Atlas Jet, not because it's better than the other airlines, but because they have a free shuttle from the airport to Selçuk. Do book early, as the price goes up closer to the travel date. 2. Book a hotel in Selçuk. We stayed at Hotel Canberra and highly recommend it; it's not fancy, but the staff was wonderfully helpful, and having the included breakfast and optional dinner on the roof was great. If you're staying more than 24 hours, they'll even do laundry (handy, as Istanbul doesn't have coin-op laundries that we could find). 3. The hotel will arrange a taxi to take you from the hotel to the upper Ephesus entrance, and pick you up from the lower entrance (not free, but inexpensive, and well worth it for the convenience). We got the audioguides, which we found worthwhile. Don't miss the Terraced Houses (extra admission charge). 4. The rest of the time, you can see other sights in the area, or just enjoy the vibe of Selçuk. We had read that it was just a place to sleep, and were pleasantly surprised by how nice and relaxing it was. No need to rent a car for this trip.