My brother started investment accounts for my children, two own stock in Southern Company, two in PSE&G (both are utility companies). Their accounts were started with $250 invested directly though the companies. Many companies have direct buy programs which require low investments to start. He puts $100 into each account for them each birthday and Christmas. It is really easy to do. You can try to go to the company's websites and get information there. I think Coca-Cola has a similar program. On the other hand, starting a Vanguard IRA at your age would be a great option, you can learn more by going to
Vanguard - Mutual funds, IRAs, ETFs, 401(k) plans, and more. Both the options I described are long term, stable investments with low or no costs. Good luck! If you want to learn more, Money magazine is great for learning about investments, I also like "The Motley Fool" investors, both websites are informative and legit.