How do I set up a PS1 Emulator on my Mac?

I own a PS1, but I'd rather play games on my computer. I have tried downloading a PS1 emulator, but I'm really confused as to how to make it work. If I download a game, what is the next step? How about getting the disc image or whatever? Can anyone help walk me through how to make it work? Thank you so much!

pretty sure this would be against forum rules...

Illegal Activity: We choose to follow United States law in regard to what is permissible to be discussed here. Therefore discussion of illegal file sharing, cracked programs, requests for serial numbers, and any other breaches of copyright or other illegal activity are not allowed in these forums.

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Emulation isn't illegal if you own the original system though.

kj21 said:

Emulation isn't illegal if you own the original system though.

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Actually, any technology that requires reverse engineering or the breaking of encryption technologies would be illegal under the DMCA.