Hardy to Zone 7 can have different interpretation and most probably it may mean that the plant will survive without protection in one shape or another i.e. the roots may survive but the plant could die to the ground and next year will start from the ground.
You are Zone 6b and it may take fair amount of work to winter protect the limbs. So start with potting in a suitable size pot with good draining soil mix. Special measure include watering on time not to stress the plant by letting the soil go dry for a long period of time. Also, you have to fertilize periodically since the nutrients get depleted with time from the soil mixture.
You will find a number of threads on soil mix in this forum and other aspects of potting culture.
In case you decide later to try planting it in ground after a few years in pot, the mature plant may have better chance of survival.
Good luck.

If you have the ability to store it in the winter in an unheated garage I would keep it in a pot and do so. I am in zone 7 and dont think I would mess around with trying to keep black jack in the ground. If you really want it in the ground, wait a year or 2, keeping it in a pot and then find a very good spot for it.