I'm a n00b at stocks, but I'm doing research. I want to open an eTrade account and buy 5 shares in AAPL. I want to do it at the right time. Stock opened at 214 and now it's up to 218.95. If I can get it at <$210 in the next couple days, that would be a good time to buy, no? And if stocks reach 260> in the coming weeks, and when I sell, then I have made $50 per share, ($250 total) correct? Is that how it works? One last question: If all I want to do is buy and sell, which company is going to be the cheapest? eTrade, Scot-Trade, td ameritrade?