Posted: 27/04/2014 at 19:45
I agree with chicky - don't prune it yet. In the summer you should cut off (flush with the trunk) at least all of the lower branches circled in red:
If it were my tree, I'd also remove the branches circled in blue:
I'd also tie it to a stake using tree ties and try to train it into a more upright shape, but that could be difficult.