Before it was stolen along with the vast majority of my fishing gear and some non dangerous hunting gear, I had a Lansky sharpener with Diamond dusted "stones". It was the best thing I've found for sharpening a knife of any straight bladed type.
I also understand that they sell a rat tail sharpener for serrated knives.
As for tips for sharpening; a) go slow, this avoids heat build-up from friction that will rob the steal of its temper slowly and make the knife get dull faster, b) don't let the knife get really dull in the first place, touching up the edge on a sharp knife when it just starts to get dull is far better than letting it get really dull then having to grind away the dullness.
Just my 2 pennys worth.

Tight lines,
Wade