I would let it grow, well fertilized, in full sun. Next spring it may pop some buds low on the trunk and/or closer to the trunk. Then you can consider what you are going to create. You likely will not want that long straight trunk. If you don't get anything popping on it below, one of those two branches will have to become your next trunk section, the other your bonsai's first branch and the trunk from there up will be the sacrifice that will get lopped off once the bottom trunk section is a thick as you want in your final bonsai. But there might be more interesting possibilities if a lower bud or two shows up next year.
Meanwhile, you might want to fiddle with wiring and bending an upper branch or two. You might also see if you can bend the trunk. I do think the trunk and branches quickly become quite stiff and hard to bend, but fiddle a bit instead of just taking my unreliable word for it. If you find that you can readily bend either or both, there are even more possibilities for you to sort through in deciding what you can and may do with it (i.e., your development plan and objectives).