It helps to know what kind of mulberry you’re propagating. White mulberry is super easy. Just just cut off your cutting at a 45 degree angle slightly below a node and plant it.
Other varieties may require more work. Again, cut off your cutting at a 45 degree angle slightly below a node. Pull all the leaves off except for a couple small ones at the top. Store cuttings in a water container until ready to plant them for rooting. Use a rooting hormone on the cutting. Gel rooting hormones work best because the gel adheres to the cutting.
Give them humidity domes like a clear trashbag. Give them plenty of time to develop roots before transplanting them. Cuttings like humidity while establishing roots. Give it a few months.
When you transplant, use mychorizal fungus to give the roots a “modem” so they can connect to the local mycelium natural internet economy where they trade sugars and minerals and enzymes.