At your age, the first thing I would do is make sure I had a "rainy day fund", enough to live on for a couple or 6 months in case things turn sour.

Next bit of advice from me will be contradicted by all the "advisors" that want you to give them you money so thay can, at minimum, take a cut of it. Invest in your self-make a guaranteed return-pay extra on your mortgage or buy real estate. If your mortgage interest rate is, say, 6%, you can make an absolutely, 100% guaranteed, 6% return on every dollar you pay off. If you really, really, need that money for another land purchase you will be able to re-borrow it.