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This article may help to refresh you on the care requirements.

https://www.gardeningknowhow.com/edible/vegetables/zucchini/growing-zucchini.htm
https://www.gardeningknowhow.com/edible/vegetables/zucchini/controlling-zucchini-insects.htm
https://www.gardeningknowhow.com/edible/vegetables/zucchini/zucchini-squash-diseases.htm

Zucchini can be dark or light green. A related hybrid, the golden zucchini, is a deep yellow or orange color. Check the seeds that you planted.

You can add some bone meal to the soil to help encourage additional flowering. Here is more information: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

Also, if you are getting mostly male flowers right now, this is normal. Given a little time and patience the plant should eventually begin forming female blooms, which produce fruit.

This typical behavior for a squash plant. They will produce mostly male (non-fruiting) blossoms early in the season and will gradually start to produce more female blossoms as the season progresses. The male blossoms typically drop from the plant and seemingly disappear. Give it some time and you will see it start fruiting.

If you continue getting flowers (including females) but no fruit, the issue is pollination. You may need to hand pollinate to make up for it. This article will help with hand pollination: https://www.gardeningknowhow.com/edible/vegetables/squash/pollinate-squash-by-hand.htm

Yes, it seems you had a bad fungal infection. This could be due to excessive water in the area. Fortunately I have a treatment that is safe, and Extremely effective. There are two parts to this method. Please don't skip the soil priming, as this will bring your pH back to normal, and kill off anything lurking in your soil. If you do not have all of the ingredients to the spray, then that is alright, but the more you have the better. My method is as follows:

First, you will want to prime the soil with dolomitic lime, then spread wettable sulfur to Kill off any infection in the soil. I Also like to spray the plant itself. Mix a few drops of one or more of these ingredients into warm water with a spoonful of coconut oil: Rosemary oil, lavender oil, neem oil, garlic oil, cinnamon extract/oil and for really bad cases, also add clove oil.

Here is an article for more information:https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm

They can be picked when they've reached a diameter of about 3 inches and when they've developed a dark green color (if it is a green variety). They can also be picked after they've grown larger, but when they're very large they won't taste as good.