Please give me some suggestion about my plan

I will visit Qingchengshan in this new year
I have a plan to take a bus from Chengdu in the morning
then i will trekking on Back of the Mount [ actually , How long for the round trekking ]

i will stay at there for a night [ do you have a hostel suggest to me ]; another day i will trek on front then go to Dujianyan in the afternoon and back to CD in the evening
[please give me a comment about my plan , is it possible and when is the last bus from Dujianyan ]

Thank you in advance