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Usually within 3-4 weeks roots should begin to develop and you should start seeing signs of growth.

The container size should be at least 5 gallons or larger. The wider the better.

You should provide a trellis for support.

They will need more frequent watering, check the soil daily and water when the first inch of soil is dry.

Nutrients are washed away with all the watering so you need to provide a complete balanced fertilizer regularly.
A slow release fertilizer can be used in early spring, or use regular fertilizer once a month.

They will need regular pruning and training.
Divide the plants every couple of years, when they are dormant--in the winter.
This is a good time to replace the soil also.

If you see a white crust start to form on the top of the soil, give the pot a good rinse to help rinse all the built up salts.

If you have been fertilizing heavy in order to try to encourage fruit, the soil may have to much nitrogen.

You can try adding some bone meal to add phosphorus.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

Personally, I like the option of drip irrigation or soaker hoses. This article may help (though it's for xeriscape areas, as far as watering anything in the garden, it would be the same principles): https://www.gardeningknowhow.com/special/xeriscape/irrigation-systems-for-xeriscape-environments.htm

Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberry-pruning.htm

You will want to give them a year to establish themselves before pruning. Here is an article on pruning holly: https://www.gardeningknowhow.com/ornamental/shrubs/holly/trimming-holly-bushes-how-to-prune-holly-bushes.htm

First-year canes, also known as primocanes, appear as stems that arch or trail along the ground. They usually bear large compound leaves with five or seven leaflets; they do not produce any flowers or fruit. Second-year canes grow to become what is known as a floricane. The stem will no longer grow taller, but will begin to produce lateral buds and flowers. Also, these normally have smaller leaves with only three or five leaflets. For information on pruning, this article should help: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberry-pruning.htm