What am I?
What is your location? Any flowers or seeds?
No seeds or flowers. The stems are very woody.
Where is the plant located? I am not optimistic that I can find a specialist to help you.
Alberta, close to Calgary
It's difficult to be certain from an image, but it would seem to be very similar to Ming aralia (Polyscias fruticosa), which has variegated types that look very much indeed like your specimen.
As for bonsai, here is a site that includes Ming Aralia with details on growing habits and how to train: http://www.livingartbonsaisociety.org/spotlight.html#Ming_Aralia