Network cards? - I'm lost

[PollyannaFlower46]

Right now we have dial-up, but we don't want to have to put a third phone line into the house in order to accomodate another computer. The computer will be in my brother's room which is right next to mine. I don't know how much $ we have to spend, but considering its not for business, I doubt its too much. I use the computer the most, especially since I'm taking 3 internet based courses this semester, so its important I can get online even if my brother needs to get on.