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Just command-r boot to recovery then use Disk Utility to erase the Macintosh HD partition to Mac OS Extended (Journaled) format. Then quit Disk Util and click reinstall OS up at the top.

But if this is a new MacBook, why would you want to do this?

Thank you, just asking really. My last issue is how or where can I purchase and place MacOSX on a USB drive for installation.
 
Purchase a blank 8GB flash drive.
Download Sierra from your App Store.
Use the steps to make a bootable macOS installer on the flash drive, using the Sierra installer app that you downloaded from the App Store.
Or, the good DiskMakerX app will do that for you without needing to use the terminal.
 
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Thank you, just asking really. My last issue is how or where can I purchase and place MacOSX on a USB drive for installation.


There is no such thing as Mac OS X anymore. It's MacOS...And unless you have a crystal ball, there will not be an update in Summer of 2017. I'd plan for Fall at the earliest. You have it in writing hold me to it. You're waaaaaaaaay ahead of yourself. With the exception of how to refer to Apples operating system.
 
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