Hey, I'm staying in Chengdu from 9th till 12th August and I'd love to visit Wolong nature reserve.

I will stay in a hostel near the Chunxi road metro station (line 2) and I'd like to go to the reserve early in the morning to have more time there. Does anyone know when and from where exactly is the first bus in the morning going to the reserve (travel date 10th August)?
Also I would like to ask if there is some place in or nearby the reserve to sleep over and whether it's even worth it to stay in the reserve for two days?
Thank you very much for the answer.
Tomas, Czech Republic