You can take flight from Indonesia to Guangzhou first. For the accurate schedule and ticket, you can search the Cheap China Flights(https://www.travelchinaguide.com/china-flights/) . Then go to Guangzhou South Railway Station to take bullet train to Yueyang. The duration of the train journey is about 3 hours. Guangzhou Train Schedule(https://www.travelchinaguide.com/china-trains/guangzhou-schedule.htm) provides the detailed information about this train journey, including the timetable, price and duration time.