I've always liked Tru Oil for most of my wood handles. Although woods like cocobolo have so much oil already I sometimes only finish with very find sanding/polishing. Use superglue to fill any pin holes or cracks. I know some guys like to soak their wood with epoxy. As far as the edge I use my eye. Bought a lansky sharpener when I was young and used to use it to check my process, don't use it anymore. Easy enough to just eye it out.