A few websites to visit before posting a new topic. These websites will give you a general idea on which components to choose, and how to assemble them together.
http://game-central.org/2009/editorials ... custom-pc/
General guide on how to choose components, and stuff to consider.
General parts guide for different budgets.
Step by Step w/ pictures on how to assemble all of the components once you receive it.
http://www.youtube.com/results?search_q ... type=&aq=f
Plenty of Videos on how to assemble a PC.