When it has been there about a week you can begin to shape it by imagining a shape you like and pruning off anything that sticks out beyond that shape. If a branch/twig is too long cut it back to a pair of leaves within the image in your mind's eye. You can scribble a drawing or two to become familiar with the possibilities and give yourself a plan to follow. Google
photos of Tigerbark bonsai. If a branch/twig is too short and you want it to grow longer, leave it be. When you cut back, more leaves will emerge on that stem back towards the trunk (origin). There is a bud in the axil of each leaf. The axil is the joint between the petiole and the stem that it grows out of it holding the leaf. The petiole in this case is very short, almost non-existent. The buds are pointed in the direction the new stem and pair of leaves will grow towards. You can see that there are very few stems that go sideways from the long stems on the plant. That is a sigh that it has been trimmed very little, if any. That will change as you trim it back. Ideally, to form a dense canopy or foliage cloud, you trim a stem back to 4 leaves and it sends out 4 new stems sideways with 8 leaves. So, you can control where it will grow and where you will not allow growth.
We make space between clouds of foliage to make something look more like a tree rather than a bush. We make clouds of foliage around a branch, so that if you have 6 branches, you develop 6 clouds of foliage. Foliage grows up, pointed at the sun (light). We trim the foliage growing from a branch in a flat, horizontal plane following the branches that are horizontal. Main branches that are vertical are referred to as trunks or minor trunks. The clouds surrounding trunks are more equilateral with foliage growing out in all directions. Try to trim the foliage with these guidelines. Remember, if you screw something up it will grow back, so don't worry about mistakes. You own bonsai so you can work on them. If you don't want to work on them you just buy pictures.
Begin this adventure by trimming all stems back to 4 leaves. Watch the growth and keep it in bounds by trimming back to 4 everywhere it gets to 6 leaves.