Advice re travel to Lanzhou - Langmusi - Chengdu please!

Hi

Any help appreciated with regards to travels methods, bus times, places of interest along the way.

Arriving in Beijing and flying to Xi%26#39;ian then on to Lanzhou. Then the real travel starts.

1. I assume I need to get a bus from Lanzhou to Langmusi via Xiahe - is that right? Or is there another place you can go via? Does anyone know how long tihis will take and if it can be done in a day?

2. Then Langmusi to Chengdu via Songpan - is that right? Or can that be done via somewhere else too?

3. If we need need to stop overnight at either Xiahe or Songpan, does anyone know anything good to do there?

4. I reckon we will fly from Chengdu to Lijiang, to save time, udoes anyone know how long it would take on a bus and if it is direct? I%26#39;m under the impression is take over 28 hours for some reason?

Thanks in advance.

Dani UK