Well, I think you want to heal that wound off and get a start in a new direction... Oh.. You mean about the tree?
Same thing! For the tree, make sure you don't have too many sprouts growing out of the same place. Pick a good leader for the new top, but keep a couple shoots growing on the opposite side help close the wound.
This will all happen most quickly in a growing size container, so don't be in a rush with this one to make it a bonsai too fast.
As far as styles are concerned. Take a look at this tiny bonsai. It does a great job of suggesting a wisteria or willow The trailing branches and the foliage that seems to grow in fountains.
That thing is really small. You can see it in context here:
http://www.lost-oasis.com/bonsai/bo...hin/shohin.html
Regards,
Matt