Hi,
Hello, it is my first time occupying jlcpb and lcsc, I have seen that PCB and component orders can be combined, I need to know how it should be, first I pay for the pcbs with shipping and then I pay for the components?
or
First I pay for the components in lcsc and then I pay for the ´PCBS?
Thank you
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Tutorial.
https://docs.easyeda.com/en/PCB/Order-PCB/index.html