An "Arkansas" stone .... one medium and one fine .... any light weight oil from a special honing type oil to 3-in-1. A well designed diamond sust sharpener will work well too.

A key is to not let the blade dull out in the first place ... learn to hold the proper angle ... doesn't take a lot of pressure. Take you time with the stroke, keeping it precise and develop a "feel" the metal against the stone and you'll have a super sharp knife in only a few strokes. There are lots of good instructions on how to use a stone sharpener.