What should I invest in?

I just turned 26, single with no kids. I'm in college right now but I need advice on how I should invest about $5,000. I have perfect credit and payed off all of my credit cards. I was thinking about buying a duplex in the North Dallas area and renting out both sides to create income. I want to be self employed and live comfortable by the time I'm 30. I work full time and have been looking into ways to create passive income. Some type of rental property or online website/ business looks like a good move, just need more opinions/ options. I'm open to all reasonable suggestions. Thank you