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Here's all the information you need to start off your allamanda plant: https://www.gardeningknowhow.com/houseplants/golden-trumpet/allamanda-indoors.htm
I would recommend using any potting soil (not one with moisture-retentive additives) or african violet soil, with an equal quantity of perlite added. Regarding fertilizer, a balanced 6-6-6 or 10-10-10 would work well. Make sure to water enough that you get a good run off from the drainage holes every time, to make sure all roots are moistened, as well as to avoid buildup of unused fertilizer salts.

Yes, these plants will work nicely together in a warm climate garden. Here is more info:

https://www.gardeningknowhow.com/ornamental/shrubs/ixora/growing-ixora-shrubs.htm

https://www.gardeningknowhow.com/houseplants/golden-trumpet/allamanda-indoors.htm

Allamanta should be pruned in early spring. You can cut back about 1/3 of the bush per year. This will encourage new growth and more flowering.

Yes, the longer you leave them, the better the chance that they have to be able to germinate. Take them right before they fall out if possible.

Here is an article to refresh you on their care: https://www.gardeningknowhow.com/houseplants/golden-trumpet/allamanda-indoors.htm

Unfortunately, This little guy is an extreme pest! They will destroy plants, relatively quickly. This is the Oleander Caterpillar.

This link, from the University of Florida will help:

http://entnemdept.ufl.edu/creatures/ORN/oleander_caterpillar.htm

I have answered this on the original question, but just in case- No, that is a pest that will kill your plants. Both the larval and adult stage will destroy many different plants.

This article will help you to get rid of them:

https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm