Hello Community,
I have some trees that I am wondering what to do with.
Welcome to this forum!
Your little trees are still very young, so I would wait for some time. Keep them healthy, water them properly, put them outside as much as you can (if the temperatures allow, of course).
Wiring at the moment can be done to make trunk and main branches (IF they're going to stay and not be cut later) not so straight (boring!), but this can wait also.
Your plants need flaring roots and thick trunks *before* ramification and reduced leaves, and both take time.
Years, in fact.
A tip to thicken the trunk and create a strong root system: plant them on the ground if it's possible, or in colanders/pond boxes for some seasons.
NOT cutting the strong branches and letting them get longer helps to thicken the trunk also.
Patience is the name of this game.