Sterile potting mix, something like what you start seeds indoors with. Mix half potting mix, half perlite in a container. Stick the cutting, don't use a rooting hormone. Water well, place it in a plastic bag, set it in full shade. It should be rooted in 2-3 weeks. I did that before I got my cloner. I have also rooted them in water, but they don't transplant well and seemed to take forever to get growing again.

If the top broke off - you still have the roots right?

I would say just put the roots in the ground if you have a strong section of root.
My pineapple sage got hit by the frost after I had it in the ground. The top half got hit, and I cut the leaves, I didn't know if I should cut the central stem, since it was just a stem and no flowers.

I left it in the ground and gradually it started to fill out with leaves.
Hope this helps.
They are great plants.

ellen