Not easy, will take some time to develop, and leaves will not reduce beyond a certain point.
The "finished" bonsai trees that are shown in exhibitions and in photographs are the result of years of behind-the-scenes training. Most of this training takes place in special, training beds, or, extra large pots/containers, so that the plant can develop a thick trunk. Deciduous material, like figs, maples, oak, get their trunk, and thick branches chopped back, and new buds will sprout from the cuts. The trunk and roots are trained first, and the top end of the tree, i.e. smaller branches, twigs, leaves fruit, is the last thing to be developed. This process can go on for years, and the training process ends when the trunk, branches and twigs are selectively pruned to look like.....a bonsai. Roots are also trained to grow and spread at the soil line, and are encouraged to twist and undulate along the surface. This technique simulates great age, along with a fat trunk, and ramified branch tips....twigs. (Search: "Trunk-Chop")
Leaves can be pruned off a healthy tree, and a new, smaller crop of leaves will grow. However Edible Fig leaves will never grow very small, nor be in scale with the rest of the tree, unless you settle for a very large bonsai. Fruits, also, rarely reduce in scale. (Search: Leaf-Pruning).
Most photos of "finished" trees are taken at the precise stage when the tree is at, and looks its best. It will take constant attention to grow successful bonsai, and the small volume of soil in those shallow, exhibition, tray-like pots, can dry out within hours. Trees need water, special fertilizers, and cannot be left alone while you are off on some vacation. Deciduous species from temperate climates must go through the seasons just like any other temperate climate tree, and the trees cannot be brought into the house for any extended length of time. Tropical species can make a decent "house plant" providing you can give them enough light, fresh air, and the correct temps.
It can be done.
Frank