Help with starting a online business?

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Im a 17 year old kid an since I was little lots of ambition of generating my own profits. I really want to start using the internet to do this. Not to brag but im kind of a brain, good grades etc. And im really into business and starting my own little buy an sell company online. I’m about to be 18 and I’m just asking for 200 dollars from my family to start buying little items to sell. Im not into “mission statements” an “slogans” Im more interested in a Formula for profit type thing. My returns on ALL investments etc. So any tips on like what items I can find really cheap or just have a eye for? An any general tips on how to start an what not? Thank you Yahoo Answers