What's your question? Ask

This guide should help: https://www.arborday.org/shopping/trees/fspacing.cfm

Since you live in an area with harsh winters, it may be better to grow fruit trees in containers, leaving them out all summer and bringing them indoors for overwintering. All of these trees you listed, except for the peach, will do well in containers where you live. If you want to grow peaches, you will need to find a variety that is suited for your area. Peaches and nectarines need a certain amount of cold to bloom, and you will need to look for a "low chill" variety. Of course, it may be possible to find other hardy fruit trees as well. Check with your local garden center for help with this.

You will also need to make sure you can give your container fruit trees enough water. They will need watering daily most of the time.

I would recommend using a product called Safer Bug Patrol and follow the directions on the label for use around fruit trees. It can be purchased in a handy hose end sprayer bottle.

This could be due to poor pollination or something lacking in the soil. It could be low on phosphorus, which is responsible for flowering and fruiting. I would have your soil tested to see what, if anything, is missing and then fix it accordingly. These articles should help: https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

Several things can cause this. Here is more information that can help: http://extension.oregonstate.edu/gardening/node/889

If the fungus is powdery, then it is powdery mildew. A fungicide will help to clear it up and some pruning to increase airflow will help to keep it from coming back.