Clean with leather soap. Do not use any oils on the leather, as this will soften the molded shape of the sheath. If you will not be using your knife for a period of time, remove it from the sheath. Leather contains acid that could stain your blade or excellerate rusting. Store in a display case or wrapped in a soft cloth.
All knives require sharpening after prolonged use.
It is recommended that your blade be kept well honed at all times, a sharp knife is safer to use than a dull one.