AS I recall from when I did it years ago:
Leave as much stem as possible, even the roots if you can, which is the ideal. Wrap as many of the big outer leaves up around the head as you can and tie them in place.

They do keep very well in cool weather or in the fridge at about 40 degrees a a little under. Yes, leave all the outer leaves on, it helps to reduce moisture loss.

Thank you for the information
Laurie

I've kept the last of the cabbing in the fridge for several weeks. Try wrapping in a cotton towel. Plastic bags seem to promote mold. The flavor gets stronger, but we don't mind that, and the consistency isn't so "crisp". Hey, it beats throwing away!