What's your question? Ask

Most berries will grow tart if there is some nutrient lacking in the soil. Have your soil tested and then amend the soil according to what the soil tests say is lacking. Normally, your local extension service will do a soil test for free or for a small fee.

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

Wild blackberries can carry fungus and viruses that can make your raspberries sterile (more information here: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm. Ones you buy from the store should be certified virus and fungus free. This problem does not affect blueberries.

Early spring or fall is the best time to plant them.

Blackberries only produce on 2 year old canes, so that is why you did not get any last year. You can do tip pruning right now, but do not remove the whole cane. This article will have more information:
https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberry-pruning.htm

In the spring, after any chance of frost has passed, is the best time. Early fall is the next best time.