cylinder hone

I have ordered gaskets and bought a valve polishing suction cup to rebuild the heads of my 3011 this summer:
I was thinking i might change the piston rings as well, because it ran 11000 hrs since 1967.
I know a change of piston rings requires a cylinder hone to restore the cross hatch pattern, to allow the rings to break in to the liner.

What grade of hone stone do i need, and how rough does it need to be ?
Anything to watch for when doing this job ?

I did polish some valves on a small Deutz engine in a previous job but never took down into a block before.

After that many hours I would seriously consider replacing pistons and liners.
There will be a large step at the top of the liner which you can buy a tool to remove: but the cylinder is still worn and no amount of honing will make the piston a better fit.
The honing has the effect of glaze busting rather than cross hatching, this is a by-product of the process. the replacement rings will have one that has either a taper or a step to go on its higher side.
Sorry to be so negative, Dave