Help needed installing Mint on iMac with Fusion drive

I have a 2017 Retina 5K 27" iMac with a Fusion drive that I would like to run Linux Mint on exclusively. Not interested in dual boot or VM install.

I’ve looked and looked for directions online but am not having any luck. Can anyone help me reconfigure this iMac to be a pure Linux box?

Thanks in advance,

Steve