I think you are on the right track. To refresh good edges, a 12k Naniwa is excellent and is easier to get info on use on than the plethora of barber hones out there. A 4/8 Norton will become an old standby as you learn to do more. All you will actually need from there is a 1k stone as you learn to restore edges and set bevels. The DMT is indispensable for maintaining all of these hones.
Soak the Norton, don't soak the Naniwa, take a screwdriver shaft to the surface of the DMT as you get it to knock off loose, big diamonds. You will be set. JMO