First of all, after getting off the plane, I think you should take a taxi to Chengyang North Bus Station and wait for the long-distance bus from Qingdao to Pingdu.

After arriving at Pingdu bus station, you can buy a ticket for Changle (note that this may be the kind of ticket to the township).

It takes more than half an hour from North Bus Station to Pingdu, and more than half an hour from Pingdu to Changle. It will take about three hours at most.