I'm not saying that you should avoid Migration Assistant, just that it's easier to use Setup Assistant with a virgin OS because you won't be messing with accounts that are have been already set up. Either one works with one machine and an external hard drive.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365