hello, i am travelling to Zhangjiajie from Qingdao the last week in April.

Considering the cost along the journey, hereunder is my suggestion:
You can take bullet trains to reach Yingtan or Luanxian or Shiyan from Qingdao. Then you can take a train to ZJJ directly. Upon your arrival at the local Railway Station, you can easily find a Bus Station, where there are frequent buses to the scenic area directly. The whole journey takes too much time.

If you wanna save time, it is suggested to take a plane to ZJJ directly. Then you can take the shuttle bus line A or B to the local Bus Station, where you can catch the direct bus to the attraction.