What's your question? Ask

Starting from seed is quite difficult and with that said, my research did not turn up any images to share with you.
If you started your seeds will sterile medium, I would continue to care for what may be a new plant. Time will tell if the seedlings takes on the leaf characteristics of the intended plant.

https://www.gardeningknowhow.com/houseplants/china-doll/china-doll-plant-propagation.htm

Dried up leaves can be the result of overwatering, underwatering, or other problems:

https://www.gardeningknowhow.com/plant-problems/environmental/papery-looking-leaves.htm

The best way to tell if you are over- or underwatering is to check the soil each time you water. Make sure the soil right at the top becomes dry or almost dry before you water, but don't let it stay dry for days. Also see these articles:

https://www.gardeningknowhow.com/houseplants/china-doll/radermachera-sinica.htm
https://www.gardeningknowhow.com/plant-problems/environmental/signs-of-plants-affected-by-too-much-water.htm
https://www.gardeningknowhow.com/plant-problems/environmental/under-watering.htm

Here is a link that will help you.

https://www.gardeningknowhow.com/houseplants/china-doll/prune-china-doll-plant.htm

China Doll plant (Radermachera sinica) is a pretty common plant. If you live in the United States, it shouldn't be to hard at all for you to find another one. Many of your large garden centers, nurseries, and even hardware stores get a large collection of houseplants at certain times of the year. You can call the stores directly to find out if they've received (or when they'll receive) a mixed collection of houseplants. Any local nursery with a houseplant collection worth its salt will have someone who can help you find China Doll plants.

When you do get another one, you may want to follow GardeningKnowHow's instructions on how to care for it here: https://www.gardeningknowhow.com/houseplants/china-doll/radermachera-sinica.htm

The China Doll plant (Radermachera sinica) is not considered poisonous. And yes, this is one of those interesting night-blooming plants. It's normal for the flowers to only open at night.

I don't think this tree poses a particular danger to pipes and foundations, but almost any tree can damage structures if it is planted too close. Typically, one-third to one-half of the tree's height at maturity is the minimum distance a tree should be planted to a house, and 5 feet from a sidewalk is the minimum distance.

https://www.mortonarb.org/trees-plants/tree-and-plant-advice/horticulture-care/tree-roots-and-foundation-damage