I would imagine to do it really effectively, while all your assets are in place ready to deploy, the first target would be the an unsuspecting president.☺ Then secure communications and give the announcement, control airports etc..
Yeah, that's where they screwed up, big time. Erdogan should have been the first Turk to learn of the coup. At gunpoint.
Erdogan was vacationing in Marmaris, a lovely resort on the Mediterranean. The airport where Erdogan's Gulfstream was parked is at Dalyan. Marmaris to Dalyan is 1h18m, according to Google. Erdogan managed to give a Face Time interview, travel to the airport, hop on his plane, and fly to Istanbul without being stopped.