Need help batch script #!/bash/sh

I would like to know how to do a batch script for this please:
Find all files within the /home folder {including sub- folders), delonging to a user that are not in that user's home folder. The chosen user's name is to be prompted and entered from the keyboard. The user's home folder can be retrieved from the /etc/passwd file.

This is to be from the root user.
can you help me??

thanks
katrena