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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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Fedora has always had good Mac support in my experience. Should just be able to hold option key at boot and select the USB.
If you want to continue dual booting I'd use the Mac's recovery mode to shrink the partition so it leaves space first. Other than that it should be just like normal. Hold option to get the boot menu.