I only grow Cavalo type, the curly kales to my sophisticated taste buds are bitter, horrible "I ain't eating them green bits"
I sow mine around May, straight into a pot of moist compost and wait, really smple to grow.
We have issue with clubroot, so I dig a hole, sprinkle lime around it and then fill with last years compost from the tommy plants, sprinkle some fish,blood n bone around and transplant when big enough.