Copy files algorithm

I need a coder to write 2 functions in Delphi. 1. The function will take as parameter a folder name (string) and return its length in MB. 2. The function will take 3 parameters: a) list of files to be copied including file path (TStringList) b) source folder (string) c) destination folder (string) and return true if copy operation was successful, false otherwise. I'm not interested in the GUI, a very simple one for test purposes. I need all these functions to be as a threading operation.