Open the Clover installer.
Install it to your USB with these settings. (Choose Customize in
Installation Type part)
Clover for UEFI booting only
Install Clover in the ESP
Install RC Scripts on target volume (or Install RC Scripts on other volumes)
More explanations here.
When it is finished, a disk call EFI should be mounted. Replace the original config.plist in EFI/EFI/CLOVER with the config.plist you've made.
After that, put all the kexts you have downloaded (in Gathering Kexts page) to
You have finally made the installer! You can proceed to the next part! Yay!