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I can't make a determine for you with this information.
Here are some links that may help you determine the health of your tree.

https://www.gardeningknowhow.com/edible/fruits/peach/common-peach-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/peach/treating-x-disease-in-peaches.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/common-fruit-tree-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/what-is-gummosis.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-spraying.htm
https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm
https://www.gardeningknowhow.com/plant-problems/disease/weeping-amber-in-trees.htm
https://www.gardeningknowhow.com/edible/fruits/peach/spraying-peach-trees.htm

A soil sterilant is a long lasting herbicide.

I would suggest contacting the manufacturer of the specific product used to inquire on the chance of residual chemical being in your fruit.

I personally would no consume the fruit as a precaution.

Here is an article that has more information for you.

http://www.mrt.com/news/opinion/columns/article_9afdaf26-fcb9-5062-8fbb-5e2aceb4caf4.html

Oh dear... I would first check for ants. There was a big problem with them this year in Tennessee where I am. We didn't get the heat that we normally do this year, and it stayed very mild, and the ants are CRAZY this year. No doubt, it is some pest eating the sap. they will destroy the fruit as well (when you do end up getting a harvest) I would recommend a product from FoxFarm called Force of Nature Miticide... It is marketed for mites, But I have used it on many pests, including wasps! It also, has the benefit of being antifungal if you ever have that issue. It is all natural, and very concentrated, using only 1/4 oz per bottle of water when sprayed. You really can't overdo it though. Anyways, I hope this helps, and if you have any more questions, please don't hesitate to contact me either here, or at my email at 6.schuster@gmail.com Thank You!

This is easily done while they are this young. Later, though, this can be tricky. I, myself, do a lot of container growing of trees that I should not be able to grow here in my state of TN. For now, just put them in good soil, and keep them very well lit. Reduce watering in the winter, and when they get about 2 feet tall, you will want to cut the top off about halfway down the plant. This will promote side branching and help keep them small while in container. Later you will have to do some root pruning, but you can ask that question next year. For now, just give them plenty of light, and a good quality potting soil.

The answer depends on how seriously it was damaged- if the tree is still alive, it has the potential to recover. Here's how to tell if your tree is dead or alive:

https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm

Pruning back the dead branches may help the tree to recover, but the best time to do this is probably next spring. These articles will help you:

https://www.colostate.edu/Dept/CoopExt/4dmg/Trees/freeze.htm
https://extension.missouri.edu/p/XR1

Depending on the cause, you can either trim or leave them. Gummosis is a very broad term that describes the sap leaking, but itself is not a condition. If this is caused by a canker disease, then you will want to cut affected limbs. Cankers aren't able to be cured, so removal is necessary.

If it is from pests, or tools, or any other mechanical method, then pruning is unnecessary.

Here is an article on Gummosis: https://www.gardeningknowhow.com/edible/fruits/fegen/what-is-gummosis.htm

Here is an article on canker disease: https://www.gardeningknowhow.com/plant-problems/disease/weeping-amber-in-trees.htm