Q.how do you get starters from a Pyracanthus bush
Can you just break off a limb and put in water to start roots?
Pyracanthus or Firethorn is a great candidate for propagating.
You will need to follow the directions in the link below.
https://www.gardeningknowhow.com/ornamental/shrubs/firethorn/care-of-firethorn-bush.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-root-cuttings-from-various-shrubs-bushes-and-trees.htm
soil thst is keep most is better. put several in a pot, with lowest leafs and thorns removed, then you can choose the strongest. rooting power will also help but is not nesacery.