New MultiSite install while Old install resides in root

Hi all, I’m looking to make a fresh install of WordPress Multisite. I will move over and essentially copy the network I currently have, but I do not wish to duplicate and move databases, etc. I would like a completely fresh install.

As the old/original installation resides in the root, would it be best to create the new install in a subfolder or subdomain? Does it matter? In the long run, my Multisite installation will be a subDIRECTORY install.

I have learned my fair-share through Google as most of you and am worried this will be a daunting task, or at least take more time and effort than I originally thought.

What’s the best way to go about this? Is there anything I should be aware of? Are there any sites with resources that I may have missed and would be a good guide? All thoughts are welcome. ??