Your explanation is a bit vague and confusing at the same time.
1 Yes. You can run a script with elevated rights. The used account has to have access rights to the files / folders you want to reach on the remote computer.
2 The easiest way would be to use a UNC path like \\RemotePC\c$\xx\xx
3 I don’t know how that is related to the copy job
4 If I got it right you could use Read-Host to ask for user input.
Here are some basic help topics to get you started:
I’d recommend to read the help for the cmdlets completely including the examples to learn how to use them.