Help me Build a gaming computer.

[.Achilles.]

Hey guys.

I'd appreciate help on building a gaming pc from scratch. I've never done this before and know little about which parts are worthwhile right now.
Aiming to spend £500- £600 ($800- $965), I'd like it to run BF3 well.

Any help is greatly appreciated

[Nota']

Is this still outstanding? Or have you already brought one?