Truncheon propagation

i have a question regarding truncheon propagation of the red mulberry.
I just completed a jaunt cross the top of the states and lucked into a mulberry disarming after it violated the driveway DMZ of our kind hosts.
my own mulberry at home is on the wane and i now have about 10 feet of 2-3" dia. fresh branches from tree above.
I understand you can propagate fruit trees with "truncheons", but the internet hasn't made me an instant expert, so I thought I'd ask for advice:
as I understand it, truncheoning involves thick branches, new cut, stripped or their leaves and shoved into the earth for a season.
now, is that vertically or horizontally? How many Truncheons can I get out of 10' of limb? Does one wound the bark before the burial? Does rooting hormone help, hurt, or not matter? Do I need to water the entombed? fertilize? is compost or humus better than soil? if these branches have viable shoots (a few), should I trim them at the culm and root them in the standard fashion (i.e, a pot, upright)? etc.
to the victor, a bottle of mulberry wine (deferred!) cette promesse.

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