And there you have it!
I usually take foot long healthy top cuttings and remove all leaves from the bottom half or more and make sure to have the bottom cut directly under a leaf node. I then take a gallon pot and add 2 or three inches of soil in the bottom, stand the very long (6 inch maybe) leaveless cutting down to this bottom, and then fill tightly with my soil till the top 5 inches or so of the cutting is above soil level. This forms a strong stocky bush rapidly from my experience.
Shorter cuttings work well to but not so quickly from my experience.