How is growing plums seeds done?
How Is Growing Plum Seeds
Certified GKH Gardening Expert
This article should help, but keep in mind that growing plum trees from seed will take much longer than simply planting a tree itself: https://www.ehow.com/how_5516718_plant-plum-seeds.html
For information on growing and caring for plum trees, this article will help: https://www.gardeningknowhow.com/edible/fruits/plum/growing-plum-trees.htm