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This is often caused by a chemical reaction related to fertilizer and overly moist soil, especially if the soil has organic compounds. Root rot is another reason for the smell, and another side effect off too much moisture. Remove the soil, clean out the container, and repot (if the plant's roots are still healthy) in sterilized soil or a soilless potting mix. Sterile mediums don't have this problem to the same degree because there is nothing to break down and decompose. Also, check the container carefully to ensure that adequate drainage is provided. These article should help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/sterilizing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soilless-growing-mediums.htm

This article may have some suggestions that help: https://www.gardeningknowhow.com/edible/vegetables/beans/bean-blossoms-no-pods.htm

This article will tell you what you need to know: https://www.gardeningknowhow.com/edible/vegetables/soybean/soybean-growing-information.htm

This would be perfect for beans, as long as it didn't get too hot too often. This article will give you more information on growing these: https://www.gardeningknowhow.com/edible/vegetables/soybean/soybean-growing-information.htm

You can, but there is no need to, since they are self pollinating. Just shake the flower, slightly. The male and female parts touch within the flower, already, so this may jostle pollen onto the stigma.

This article will help you to grow them:

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