What's your question? Ask

Unfortunately, there are few solutions for such a vigorous plant. The best method is to putt up everything. Pull roots, and pull new plants as they start. they will keep coming back for years once they get established. These highly invasive plants are very hard to control. You can try to spray white vinegar directly onto the plants to kill them off, but even this has no guarantee. The best way is just to keep them pulled, and killed off as fast as they can grow. Eventually the plant will have no energy to reproduce.

Boston ivy is deciduous like it's cousin Virginia creeper. English ivy is evergreen buy not a good candidate for climbing house walls. However, Boston ivy is heavily branched and these remain on the house and will, I believe, soften the look. Search for images of Boston ivy in winter to get a look.

Rooting your ivy in pots indoors, then transplanting outside is the best option. Rooting in water is possible, but the plants will develop a weaker root system and won't be as healthy. Here's how to do it:
https://www.gardeningknowhow.com/houseplants/ivy/ivy-plant-propagation.htm

Here are some other ideas for vines for privacy screens, some of which will grow in shade:
http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/vines-growing-a-living-screen/

There are 3 vines in the Parthenocissus genus, Boston ivy, Virginia creeper, and woodbine. All have good fall color, are good growers and will need some trimming to keep them the size you desire. Other options are clematis, honeysuckle vine and Virgin's bower, a native Clematis. Honeysuckle vines are quite vigorous, depending on which you choose. Japanese honeysuckle vine is considered invasive in some areas. There are 2 annual, quick-growing vines worth consideration - cardinal climber and cypress vine.

Yes, the aggressive growing Ivy can climb and choke out other plants.
You may want to move your perennials.

https://www.gardeningknowhow.com/ornamental/bulbs/iris/dividing-transplanting-iris.htm
https://www.gardeningknowhow.com/ornamental/bulbs/daylily/growing-daylilies.htm
https://www.gardeningknowhow.com/ornamental/groundcover/english-ivy/english-ivy-plant-care.htm

I would start with a soil test; this could answer some questions for you.
Contact your County Extension Office for a soil test kit; these are generally a few dollars.

This link will help you locate the nearest office.
https://www.gardeningknowhow.com/extension-search
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm