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Unless you want lots of 'baby' hellebores, deadheading or cutting off the faded flower stems will be beneficial to prevent reseeding. If you don't mind additional plants popping up next season, you can always leave them, or at least a few, and simply remove and toss the others.

I do not know of the site you may have purchased from.

I always recommend checking with your local garden centers, as they usually will stock plants that are most suited for your growing zone.

If you know other gardeners that grow hellebores, asking where they purchased their plants is a great way to connect with sources.

Here is a great article about hellebores!

https://www.gardeningknowhow.com/ornamental/flowers/hellebore/growing-hellebores.htm

No special care is required; indeed it is best NOT to cut down the old foliage as it offers some winter protection. In some places, the leaves are evergreen and only the tattered-looking leaves need be pruned off in spring.

Lenten rose doesn't like to be transplanted and may not flower the following year as a result. Avoid transplanting during the flowering stage and during hot weather. Keep it moist the entire growing season as it adjusts. I moved one last year and it looks fine; it's too early to say whether it will bloom this year.
https://www.gardeningknowhow.com/ornamental/flowers/hellebore/dividing-hellebore-plants.htm

Yes, and this article will help you.

https://www.gardeningknowhow.com/ornamental/flowers/hellebore/hellebore-plant-propagation.htm

Hellebore does grow close to the ground. They do best in the ground, and will multiply nicely, but you can grow them in containers. Here's how:

https://www.gardeningknowhow.com/ornamental/flowers/hellebore/growing-hellebore-in-containers.htm