So you've found yourself wanting to emulate classic PowerPC Mac OS and can't put the pieces together on how it is to work? Here's the guide you need. In this tutorial, I'll be showing you how to run Mac OS 9.0.4 in SheepShaver, although other versions work. Just substitute the ROM.
Win32 Disk Imager is a utility used to write img files to SD and USB memory devices, and up until now I was not aware of a GUI (graphical user interface) alternative for macOS.