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It sounds like it might be brown rot. This article will help:
https://www.gardeningknowhow.com/edible/fruits/peach/brown-rot-fungus.htm

Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/trees/tgen/what-does-a-dying-tree-look-like-signs-that-a-tree-is-dying.htm

There is nothing you can do for them this year. This happens when the tree is under stress and correcting it now will not fix it for this year, but will make sure that it does not happen for next year. There are many things that can stress a plant. The most common is lack of water, pests or fungus.

Try increasing water to the tree and treat it with both a fungicide and a pesticide. This should hit the source of the stress and result in better fruit next year.

It actually sounds like you have lichen. The lichen itself does not kill the tree, but they are attracted to trees that are stressed. You can say it is more of a symptom. Here is more information: https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm

Yellow leaves on a plant can happen for several reasons. The most common are watering issues, fungus on the leaves or pests. Make sure that you are watering the plant enough and treat the trees with both a fungicide and a pesticide. This should help the trees improve.

This article can help: https://www.gardeningknowhow.com/weed-identification-control/weed-trees.htm

This article will help with planting cherry seeds: https://www.gardeningknowhow.com/edible/fruits/cherry/grow-a-cherry-tree-pit.htm
Once your seedling has grown enough and is ready for outdoor planting, this article will help: https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-care.htm