If you're opting for the emulation route, this guide explains the step-by-step process for setting up your ISO files correctly in RPCS3:
If you prefer playing on original hardware, you will need a PlayStation 3 console running custom firmware (CFW) or PS3HEN. Requirements A PS3 console with CFW (like Evilnat) or PS3HEN installed. A file manager tool like multiMAN or webMAN MOD. real steel ps3 iso