Tim,
Sorry to burst your bubble but The Ancient Greek is dead right.
The industry in SA is relatively small and just about every sector in the GA industry is sewn up by one or more operators. Coming in as an outsider, as TAG says, would be financial suicide.
There have been, and there will be many like you who share the same dream. While it would be great if it were different, the reality is that the charter industry in SA - either fixed wing or helicopter - is no place for a start-up operation.
As I say, I wish it were different.
Best of luck.
JA