When you're young, you can afford to lose money.. I'd take some higher risk investments. It's basically like educated gambling and can be pretty fun once you get into it. I've flipped a few stocks on etrade for some nice gains, and lost a bit too. But win or lose, I'm learning quite a bit from the experience.
If you want safety, there is always t-bills and what not. Check out this site:
http://www.treasurydirect.gov/
You can buy investments directly from the government there and basically handle everything online.
But yeah, go talk to a professional and buy some informational books if you want to take things seriously (not oen of those MAKE HUGE SHORT TERM GAINS IN BONDS type of books, that's a big no-no). Financial knowledge is absolutely crucial for life. It can mean the difference between living out your days in paradise or in a crowded retirement home with people shitting their pants around you.