Hi James,
It's probably an ulmus (doesn't it stand on that bit of green paper that was with it?).
An ulmus is an outdoor-bonsai and the best place is in full sun or half-shade. Every 2 year the ground must be switched. Don't let the ground dry out, and fertilize it in the growing seasons. In the winter, don't expose the ulmus to frost, when the temperature comes under 0, protect it (let him stand in a cold place inside, or make a frost-free place outside)
If you want more info, let me know!
Greetings,
Youri