The easiest way to buy bitcoin is actually to do a quick online search. There are many ways to buy bitcoin, so research will be needed, but again: online searching can yield you everything that you need to know. The way you’re least likely to be scammed, however, is to find a bitcoin exchange agency (such as SpectroCoin), and go through their options. Bitcoin is a bit like stock; you have to buy when the market is low so that you can sell when the market is high.
While you can use bitcoins to buy things online, the payment is treated more like a stock option than anything else. Since the prices fluctuate a lot, always be on the lookout for a low price; there’s a finite number of bitcoins.