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Use a high phosphorus fertilizer or bone meal. The phosphorus is what plants use to make the blooms and helps with blooming. Here is more information: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

As long as you keep them watered, the temps will be fine. I would put them in a sheltered location to keep them out of the wind as this will cause them damage.

The stalk bending can be caused by too little water or too little light. For future reference, you can prop the stalk back up and enjoy the flower from it for a bit longer.

Once the flowers have faded, you can trim the stalk back to the bulb. Leave the leaves until they have turned yellow. The leaves are how they make enough energy to bloom next year, so you don't want to cut them off before they are dead. This article hasmore care information:
https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-care-instructions-how-to-care-for-an-amaryllis.htm

This article will help you with their care and their dormancy:
https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-care-instructions-how-to-care-for-an-amaryllis.htm

Once the flowers have faded, you can trim the entire stem back to the bulb with sharp scissors. This article will help with getting the flower to rebloom: https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-bloom-again.htm

These are seed pods. You can let them mature and try growing the seeds: https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-bulbs-propagation.htm

But, be aware that if you leave the seed pods on, the plant will have a smaller flower the next time it blooms due to the fact that the bulb will be splitting its energy between the seed pod and next year's flower. If you do not want to get seeds, you can simply cut the flower stalk off.