Airport transfer in Pudong Airport

We are a group of 10 people going from Delhi to Loas Angeles vis Shanghai and back. I want to know:
1) New Delhi to SH MU564, then to Los Angeles MU 583 - do we have to change the plane there, if yes give the procedure including terminal information
2) Loas Angeles to SH MU586. then to New Delhi MU 563 - do we have to change the plane there, if yes give the procedure including terminal information and facility of stay at airport hotel there(as the stay is about 20 hours) and charges, if any.

Regards