What should I do with this Ficus Ginseng?
Treat it like a normal houseplant. Prune it when necessary to maintain it's shape.
Try and use the search function of the forum, look for 'Ginseng'. The same plant and the same question are posted almost daily.
I believe it has been trained and therefore just needs pruning and re-potting?
This is not a bonsai - and it has not been trained as a bonsai.