Your best results will come from finding a place to plant it in the ground to gain some girth in the trunk. You do not need to worry about any refinement tecniques such as needle plucking or candlework at this point. As previously mentioned, you can wire the trunk to put some movement in it; but in all likelihood, the trunk that it has now will not be the trunk it will have later as a bonsai. Several years down the road, after it has gained some inches, you will probably remove most the current main trunk in favor of a low branch to be trained as the new apex. This will give your tree better movement and taper. If, by chance you happen to have a formal upright tree in mind for the (distant) future, pay no attention to all the suggestions about movement.