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Linux on iMac?
(jlai.lu)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Sounds like definitely Intel. Macs have EFI (Extensible Firmware Interface) rather than BIOS. Attach the install media and hold Option when powering up. This will take you to the EFI boot loader, where you should see icons for each potential startup disk. Select the Linux installer and hit Return or click the button to advance.
I don't know which distros have the best support for different generations of Apple hardware. You should be able to get some sense of whether the distro is a good candidate from observing whether the mouse and kbd are functional before you commit to the install.