Advice for pruning North Star cherry
I just recieved a North Star cherry tree as a gift, and am about to put it in the ground. Thing is, I've read that cherry trees should be trained to have a handful of large, thick "scaffold" branches that are at a wide angle from the trunk, and this tree has a lot of long, thin branches, most of which are at fairly sharp angles. (As you can see below)
So, should I be thinning out/pruning back this tree? And maybe trying to train some of the branches to be at a wider angle? Of course, maybe I should leave it alone for now so it has plenty of energy to build its root system. I'd appreciate your advice.
Some other info, in case you want it: I live in Madison, Indiana, right on the border between zones 5b and 6a. I don't know what rootstock this tree is on, unfortunately.
The tree is B&B, and about 5 feet tall, 6 if you include the root ball.
Closeup of branches:
I can get more pictures if necessary. Thanks.