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Compost your tomato plant if it was free of disease and insect pests. Place in trash, if you don't have a municipal compost option, if the plant was diseased or infested.

One option is to pull up the whole tomato plant and hang it up in your basement. The tomatoes will keep ripening on the vine somewhat.
Here is another way to ripen green tomatoes:
https://www.gardeningknowhow.com/edible/vegetables/tomato/how-to-turn-green-tomatoes-red-how-to-store-tomatoes-in-the-fall.htm

Any that still don't turn red can be made into tomato pickles, fried green tomatoes, or relish!

This sounds like a fungal infection in the soil. Do you plant in the same soil each time? I would apply wettable sufur to control this. Here is an article with more information on the care of tomatoes:

https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm

I am sorry, but we are not geared to help with large scale farming such as this. I can give you a link that will help you locate your local extension, and they will be able to help you with that kind of farming.

This will help you find your local extension service: https://www.gardeningknowhow.com/extension-search/

This is very unfortunate. I would suggest mulching heavily, and covering with with burlap, making sure that nothing is getting crushed. It is likely that they will sustain some damage but doing this will make it more likely that they will survive.

This is, actually, a pretty simple fix! This is a calcium deficiency, which causes blossom end rot. Calcium also likes to be paired with magnesium, since they rely on each other for uptake.

I would recommend using dolomitic lime in the soil before, during, and after, as this prevents many problems that will plague tomatoes, in ground, and especially in container.

This article will give you more ways of controlling this issue: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm