mutual fund question

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I have a little over $1K in an oppenheimer fund.. know its not much but I am still in college. I understand stocks and load fees but the trading times/prices on mutual funds I don't quite understand. I know you buy the mutual fund after market hours but I was wondering if there was any way to trade these on a daily basis and make a profit. I didn't pay attention to exactly what price I got when I first bought in, but do you get the price that it is listed as when you put in your order or the price that it goes up to after hours? For example if the fund is listed at $50 a share now (what it traded at last night?) and I put in an order before the market closes. Tomorrow the price shows $60 a share, so did I buy at $50 or $60? Any advice appreciated. Thanks