Beijing to Lanzhou or Linxia

Hi , my wife and I plan to fly from Beijing to Lanzhou or Linxia on the morning of 10 May 2017, stay one night and then continue our trip to Dun Huang the following afternoon , using plane , train or bus ( overnight service is also o.k) which ever is convenient. We plan to stay in Dun Huang for 02 nights . On the 14 afternoon or evening we will depart Dun Huang for another city where we will stay for a night before returning to Beijing. Our flight home to Kuala Lumpur is confirmed on 17 May
I hope you can give us some information and suggestions on how to improve our travel plan
Thank you