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Cutworms normally feed at the base of the plant. Animals such as deer, rabbits and birds eat flowers. This article explains why the blossoms drop:

https://www.gardeningknowhow.com/edible/vegetables/zucchini/why-zucchini-blossoms-fall-off-the-plant.htm

https://www.gardeningknowhow.com/edible/vegetables/squash/female-male-squash-blossoms.htm

https://www.gardeningknowhow.com/plant-problems/pests/animals/keep-rabbits-out-of-gardens.htm

This is unfortunate.

Squash Mosaic Virus is most likely. This disease is not treatable. Here is an article that will help you manage the disease:

https://www.gardeningknowhow.com/edible/vegetables/squash/mosaic-on-squash.htm

The best thing will be to plant things that are unrelated to the plant, since the particular species of the virus thrives on squash and its relatives.

There will be no fruit if you take off the flowers. That is where the fruit comes from. That flower is a male. It will be responsible for pollinating the female flowers that will show up eventually, which will bear the fruit.

This article will help you to grow zucchini:

https://www.gardeningknowhow.com/edible/vegetables/zucchini/zucchini-container-care.htm

These look fine. They've over-grown and may be tougher than others, but if you remove the seeds and just use the flesh, they should be quite edible. Unless a squash is mushy or stringy on the inside or has very dull or marred skin, it should be okay to use for cooking. https://www.gardeningknowhow.com/edible/vegetables/zucchini/zucchini-squash-harvesting.htm

This article will help you with this common issue:

https://www.gardeningknowhow.com/edible/vegetables/zucchini/why-zucchini-blossoms-fall-off-the-plant.htm

They don't appear to be mature enough to fruit, yet. This will take patience and proper care. Here are some articles that will help:

https://www.gardeningknowhow.com/edible/vegetables/zucchini/growing-zucchini.htm

https://www.gardeningknowhow.com/edible/vegetables/cucumber/tips-for-growing-cucumbers.htm