Caledonian, not wishing to be negative but there is the old joke/factoid.....
How do you make a small fortune in aviation....... Start off with a large fortune.
In my 10 odd years of flying I have only met one couple who managed to make a good living from running a flying school without owning the airfield etc as Strateandlevel pointed out. I've only ever rented an aircraft to a flying school and that was a marginal (in profit terms) enterprise. At the moment you would be better advised to buy GlaxoSmithKline shares (don't blame me if you subsequently lose your shirt on them
).