This is the question that has to be answered first; from here, we can assist you with more pertinent specifics of the components.
Budget is foremost; as I've seen so-called gaming systems go from less than $600 to way over $10,000
I have had a laptop all through college and now I am looking to upgrade to a desktop, and with Battlefield 3 coming out I would like to get it for PC. However, I am fairly ignorant to what you really need in a computer for true gaming. I basically have no idea what I'm looking for. But I know that I want to be able to run Battlefield 3 on full, and then that will transfer to running other games full. Any suggestions on where to begin?