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You are in luck! This article will give you all of this information: https://www.gardeningknowhow.com/special/children/gourd-birdhouse-for-kids.htm

You may have to hand pollinate the female buds. sometimes the males and females show at different times, so if you cannot find one to pollinate with, then wait for one and dry the flower with pollen in it for later use.

Sometimes this can also happen from a lack of nutrients.

this article will give you more information: https://www.gardeningknowhow.com/plant-problems/environmental/why-healthy-blooms-fall.htm

You could spray the vine with sugar water to attract bees. This may get you some pollination!

The main issue with bottle gourd is pollination even though it produces large number of male and female flowers (generally 10:1 ratio). Pollination depends on bees. In general if the pollination does not occur, female flower will grow initially but fall off later. So if your garden is lack of bees you should go for hand pollination.

Hand pollination can be done by using soft brush. Run the soft brush on opened male flower and then on to female flower. Repeat the procedure for 2 to 3 days. (Both flowers look similar but male flower grows on long peduncle and female flower on short peduncle but it has an ovary in the shape of the fruit).
Extreme heat is the likely reason for not flowering.

Add some mulch around the base of the vine to help keep the roots cool and moisture levels up.

There appear to be multiple plants. I see a bean leaf, for sure. That is more than one plant type.

I see signs of magnesium deficiency, but it may be due to a pH swing, since I see signs of that as well.

Here are some articles that will help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm

An abundance of male flowers, with a lacking of female flower in gourds is usually an environmental issue. High heat, low humidity, shade, and underwatering can all cause these symptoms. Usually once the weather cools down, or humidity returns, there will be a better ratio of male to female blooms.

Alternatively, sometimes age plays a role here- Often, in a young gourd, male flowers will show first, and for quite a while before you see your first female blossom, which is attached to a miniature fruit. This is a waiting game. You just have to wait it out from here.

Here is an article that will help you to grow these to their potential: https://www.gardeningknowhow.com/edible/vegetables/gourd/growing-gourd-plants.htm