hi. newbie here. only heard about mileage earning a couple months ago. i'm kind of confuse on this miles earning stuff and hopefully someone can help. thanks in advance

i bought tickets from LAX > CAN (guangzhou), plan to stay there for 2 weeks and then fly from CAN > LJG (lijiang) for 1 week. so my questions are

1. i bought tickets for my family, can i claim their miles or do they have to each set up individual accounts and claim their own miles?

2. how are miles calculated? is it base on the round trip total miles?

3. how do i request the miles into my sky pearl account online? i was planning on claiming the miles from LA to guangzhou and use those miles to buy tickets to lijiang (if possible). or should i join a different sky team member program? i'm based in san francisco bay area.

let me know if i post in the wrong board. thank you.