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Here is information that will help with that: https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm

Compost or manure makes great fertilizer for vegetables. This article should help as well: https://www.gardeningknowhow.com/edible/vegetables/vgen/fertilizer-options-for-your-vegetable-garden.htm

Yes, they're great as fertilizer. Here is more information: https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm

I have heard about it and there seem to be mixed reviews. Some people swear by it, while others warn to steer clear. The products consist of various potting mediums or nutrient supplements. If you care to try any, do so with caution and common sense. Do not overload your plants, especially stressed ones, with too many nutrients. This can be just as bad. Read the label instructions carefully and use your own judgment.

Fish bones will not have the same nutrients as traditional bone meal because fish have cartilage and mammals have calcium based skeletons. That being said, fish have long been used as fertilizer in gardens so it would still be very beneficial.

You can dry the bones without an over by laying them out on newspaper in a single layer in a dry location. A sunny location would work best. You can also just put the bones as is directly into the soil without drying and they will decompose quickly there.

This article on interpreting soil tests gives you the general ranges that are considered healthy for all nutrients in the soil:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/14361/ec1478.pdf;jsessionid=7B15AA030DA9997721BDB985E6FA97F7?sequence=1

While vegetables do need different levels, you can kind of think of your soil as a buffet for your plants. They will take what they need and you just need to make sure you have enough of any and all nutrients to keep them happy.