Since you likely don't have a PowerPC Macintosh G3 sitting on your desk, you’ll need an emulator. Here is the standard workflow:
This refers to the "Hackintosh" project. Since Apple moved to Intel processors in 2006, enthusiasts have created ISOs to run macOS on standard PCs. mac os 86 iso extra quality
Mac OS 8.6 is often cited as the most stable version of the classic operating system before the transition to OS 9. It is the "sweet spot" for several reasons: Since you likely don't have a PowerPC Macintosh
The image must contain the proper partition map to be recognized as a startup disk. mac os 86 iso extra quality