1. Format drive with the defaults using Disk Utility and name it "Untitled".
2. Download macOS Installer App from Mac App Store (Note: If you use this installer it will not be usable again).
3. Open Terminal and run:
5. Plug in the USB drive.
6. Turn the machine on and hold down the Option (ALT) key until you get a list of drives.
7. Choose the installer, and follow the directions.