The best approach would be to invest few grand currently and wait for the price to increase to say 2-3k per BTC then sell them. You won't really get rich but your money can be doubled if you invest properly.
Many websites of investment bitcoin are scam. You must be a smart investors and choose trusted invest site.
Yes, I feel the better is starting a own business based on bitcoin. But there are very much shortage for bitcoin related business initiatives. If we innovate anything similar to exchange or open bazaar then the plan for becoming based on bitcoins will definitely reach it's reality.