Hi, according to Google:
"
Master boot record (
MBR) disks use the standard BIOS partition table.
GUID partition table (
GPT) disks use unified extensible firmware interface (UEFI)"
So, I think what Going Bald is trying to get you to do is initialize your potential Windows drive with a GUID partition table, so it will then be ready to install your new Windows 10 UEFI OS on it.
I don't think you need an OS X Install Drive to do this - it should be possible to use Disk Utility from your macOS install. However, you will need a Windows 10 USB Stick installer, and I'm assuming you have one if you're attempting this. So, slightly altering Going Bald's instructions starting at "For Win 10": Before attempting this, enable CSM in your BIOS, and I would also disable your macOS SATA drive in the BIOS after you've finished initialising the Windows SSD with Disk Utility. I believe this can be done by going into Advanced -> PCH Storage Configuration (then setting the port for the drive to disabled) in your BIOS. So:
"Go to Utilities->Disk Utility app on macOS and format your newly-attached Windows drive - single partition GUID/Mac OS Extended (Journaled). When done, exit Disk Utility.
Disable macOS drive in BIOS. insert the Win10 USB, boot the system and at the POST hit the Function hotkey (F8) that allows you to select a boot device.
Windows shows up as USB: Win10Installer (or whatever you named the USB) and as UEFI USB: Win10Installer.
At the installation screen, select Custom Install. At the next screen select the OS X partition and delete it - do not delete the EFI partition. With the resulting free space hi-lited, install Windows to the space. The installer will create and format the partitions for you. When finished, update and install your 3rd party apps and security suite. Reboot to BIOS/UEFI and disable CSM. Save&exit, continue boot to desktop. Shut down, disconnect the drive."
Then re-enable the macOS SATA port in your BIOS, and set you macOS drive to be the first booting device in the Boot section of your BIOS. I think the Windows drive should show up automatically next time you enter the Clover boot screen (by holding any key at startup), and there are ways to tidy up the Clover Boot screen, but that can wait for another time
Also if you get Windows and macOS dual-booting (which I recommend anyway, as you'll always have an OS to fallback on if something goes wrong with one of them)
Paragon Software sell some good software for each OS that will let you view files on each drive from the respective operating systems.