DaisyI said:If its a Japanese Maple, it will be prettier and easier to manage if you don't prune it at all. Pruning a Japanese Maple is almost an art form. Let it grow and see what you have before making any decisions about its future.
The only decision you need to make now is do you want a multi-trunked tree or a single trunked tree. I think multi-trunked Japanese Maples are gorgeous but its all a matter of taste. It looks like the second trunk has been cut or broken so it might be best if this tree is single trunked. Cutting the second trunk off would also relieve some of the stress on the root system.
RpR said:Not knowing what your lawn looks like or what type of Maple it is, I would still say put it some where else; too close to what appears to be a garden.BHI