American beech

I have collected an american beech. I love it. Has a great rooting system when dug. I trimmed the roots a tad to get it in a pot. So I have some questions. First when to prune? I don't plan on doing much but the apical branches are long. Plenty of buds on them. I'm going to practice keeping it healthy and alive seems to be doing fine now. Second is the soil I was told kanuma was the way to go. But is there anything else that I wouldn't have to order? And if I get kanuma can you reuse it? Thanks.

I wish you success and hope someone can give you some good advice but all I can offer is a word of caution with this species.
I only have one encounter with transplanting american beach from the wild. I found a great tree more than 20 years ago and dug it in the early spring. It survived in a large box mostly filled with coarse sand until the following spring. Around late May and early June orange powdery dots developed all over the lower trunk. It was beach blight and my tree died soon after the attack.

After the first years growth, if it's had a good healthy season, can you prune. we need to see more of these.