All the above, and you will find out that the tree will have die backs, so if you trim now, you may end up with nothing. It is best to take cuttings in early spring when all danger of frost has passed. the young tree needs all its energy. if you are happy with its shape in the spring, you can trim some or if you live in an area where you will have much left of summer days, you could pinch the tip to force it to branch out a bit, or just pull the branch down a bit and it will form other side branches. I find that a small rock on a bag with hook, just enough to bend the branch a little is enough to make it send out other side branches. If was mine, I would do nothing with it... be patient. let it grow as it want, it looks quite charming as is.