Thank you for writing.
Most eating plums are grown from grafts consisting of a hardy root and a delicious top.  The plum pits are the genetics of the top.  Without the hardy roots, you will not get as robust a plant.
Nevertheless, here are instructions. 
https://www.gardeningknowhow.com/edible/fruits/plum/planting-plum-pits.htm
Also, the pollination issues are complex especially with an unknown pit. https://skynursery.com/wp-content/uploads/2021/08/Pollination-Chart-Plum.pdf

Actually, the plums I'm referring to are wild, native plums.  They are not cultivated or grafted.  The link below is of the plum species I'm referring to:
https://www.threeriversparks.org/blog/species-spotlight-american-plum

Is the link you posted still applicable?

Thanks,
Mark

Thank you for writing.
Wild plums are not self pollinating and need a pollinator pair. https://minnetonkaorchards.com/wild-plum-tree/#:~:text=They%20do%20not%20self%20pollinate,is%20pollinated%20by%20insect%20pollinators.

Keep in mind that some wild plums are not really wild but are the result of someone tossing a plum pit after they were done with it and it took root by happenstance. In such a case, if this was the top of a graft, you would get the fruit but it would be weaker than the original grafted tree that produced the fruit.

Here is how to identify a wild plum.