Leather sheaths are great for toting and presentation of a knife, but a quality blade should NEVER BE STORED IN LEATHER.
Knives should not be placed together, such as in a drawer where they can scratch and rub against other knives or other items.
Knives should be cleaned after using by wiping with 3-in-1 oil or a similar oil.
Knives have a multitude of functions: cutting, skinning, boning, filleting, chopping, slicing BUT never use a knife as a prybar or a screwdriver. Use a prybar or a screwdriver for those tasks!
There are many good knife sharpeners on the market today. Sharpen your knife with a nice easy-to-use sharpener of your liking. Pay attention to what you are doing and follow directions. You may also contact me to arrange for professional sharpening and restoration of your blade. My 440-C Stainless Steel blades are hardened to Rockwell 57-58 and I make them razor sharp, so the edge will remain sharp for a good long time.
SAFETY FIRST! GoingPrepared.com has a nice bit of safety info here.
At the Blade Show 2007 in Atlanta, I demonstrated how I grind a knife blade on a Burr King grinder. The folks at Burr King made a video and you can click here to see it: