My guess, without seeing a pic, is that you let it grow. Foliage drives thickness, it may get 6'-8' before you chop. Resist the temptation to "do" something, and spend some of the time waiting by reading about Bonsai and how to grow decidious trees. There is a maple subforum with a wealth of information.Do I clip the lead buds to keep them shorter? How? Where? Or do I let it get taller than I want it, and then cut it back? As you can tell I’m a total newbie.,