Travel to Zhuzhou, Hunan Province from USA

Hi, we are traveling to visit a family member in Zhuzhou, Hunan Province. We would like to stop in Thailand and HongKong. What would be the best route and what airports should we try to book our travel to arrive and depart from? We are just beginning to plan, and will have 18 days with a 4 -5 day stop over in Zhuzhou.