Chengdu, Jiuzhaigou, Huanglong, Mt. Emei, Leshan and Meishan

From Chengdu to Jiuzhaigou and Huanglong, the fastest way is to take a plane. To reach Emei Mountain, Meishan and Leshan, you can take long distance bus from Xinnanmen Bus Station.
To reach Leshan, the ticket fare is around 42 RMB, to Mt Emei is about 36 RMB and to Meishan is 42 RMB.
Jiuzhaigou and Huanglong need to be finished visiting together and it is suggested to live in JZG where you can find some small home stay hostel. You can find many buses or vans at the entrance of the valley.
For other three places, it is suggested to live in the city center, which is easy for you to find buses.
Actually, you can find many interesting places in Chengdu only such as the Gaint Panda Breeding Center and many local style streets, which are worth visiting.
In my opinion, if you want to cover all these places in a tour, you can ask a tour angency for help to arrange all of them for you. It may be difficult for to take the public transportation to travel among them. If you need, TravelChinaGuide is suggested for you. You can send email for them at tourstravelchinaguide.
If you want to travel carefully, 12 to 15 days are recommended for you.