what you should do is go on youtube and watch this play list: http://www.youtube.com/watch?v=NNbEBARu6LY&feature=list_related&playnext=1&list=SPC315B2A086BA6AAF

After you should look up some hardware online or in your local computer shop. After watching the play list you should be able to decide what to put in your computer.

Recommendations:

If i where to build your computer.

Case: nothing fancy
Motherboard: something lasting
cpu: i3 dual core
Ram: 3-4 gb
graphics card : nvidia 250 gts
power supply: 450 w

hope i helped ^^

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