With 5k to invest you have very little to risk even if you think you will not touch it in 5 years. Lets say you bought ABC Company and in two months you were down 50% and now your investment was worth $2500 do you think you will still hold on for dear life? You have to really figure out if you are a buy-and-hold investor. If you are you can look at what
Warren Buffet holds at this link. He was down HUGE last year, but since he is worth billions it barely matters.
Otherwise with 5k think about parsing it out to reduce risk. If you follow the Ivy Portfolio theory and buy 20% Bonds, 20% Commodities, 20% U.S. Stocks, 20% Foreign and use a broker like eTrade you already spent $40 in commission and are in the hole.
Take the 5k open an account at Fidelity and purchase Fidelity no-load mutual funds so that you do not have any transaction costs. Put 50% in Bonds, 50% in stocks and maybe in the next 12 months you may have a 8% profit.