I have the same motherboard and CPU: i5-9600K with a Nitro+ RX580 card. How do I get this set up? I'm new to this. The MB is Z390 Aurora WiFi Pro like yours.
Thank you in advance.
This thread that you are in has a great how-to. That can get you started. If you don't want to know all the ins and outs of this whole process, I have an easier method. Read below.
Here is the process I used on my latest drive that I installed macOS onto my Z390 Aorus Pro Wifi.
I used a 2 USB stick process. I think you can get away with one stick with two partitions (I just keep a 1GB stick with only the boot folder on it as a backup).
First, download UniBeast. Then format a USB Stick to Mac OS Extended (not Fat32 or exFat). IF the disk is over 32GB, then partition it down to at least 8GB for that macOS Extended partition. You can format the other partition how you want.
Next you'll want a Clover boot drive. Format either another USB drive or partition your other drive. Go to my thread
and grab my EFI folder. (Honestly, it's the easiest method, and you'll have full USB3.0 speeds during your install).
Unzip and place the EFI folder into your Fat32 drive.
Run UniBeast. Select Bootloader EFI. Graphics leave blank as your RX 580 card is natively supported.
After it has created the drive, stick the USB into your computer, and boot off of the UEFI folder on the USB stick.
After you have it all setup, you'll have to run Clover Configurator. Go to Mount EFI. Mount the partition of your hard drive/SSD. Open it and copy the EFI folder from your USB stick. Now you can go back to BIOS and tell it to boot off of the hard drive. You should be good to go.
Here is the link
to my thread that also has my EFI folder.
Note: I'm assuming you have an actual Mac so that you can download macOS from Apple's Mac App Store.