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After removing plant from container, position root ball about 2'' below soil level. This will help channel water to the roots when you water.

Pruning normally takes place in early spring or fall, but generally spring is preferable. The plant can be severely pruned back to just a few buds if necessary and will come back fine.

There are a number of free pergola designs that can help get you started. Here are a few: http://freebies.about.com/od/free-plans/tp/free-pergola-plans.htm, http://free.woodworking-plans.org/pergola-plans.html

It sounds like it may be thrips. They can attack the base of the flowers and kill them before they open. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm

By sturdy we mean not plastic or anything easily breakable. Most people choose large planters, like clay or Polyresin. Just make sure it provides adequate drainage. If you need a large container and you do not care what it looks like, especially since it will be sunk in ground, consider feed troughs at animal feed stores. They are sturdy but not as expensive as a formal planter that size would be. For more info on containers, this article will help: https://www.gardeningknowhow.com/special/containers/choosing-containers-for-potted-environments.htm

This article should answer some questions: https://www.gardeningknowhow.com/ornamental/vines/trumpet-vine/trumpet-vine-no-blooms.htm