Hey if your really into Mass Effect and want to prepare for it some more, i'd definitely suggest buying the 4 comics-Mass Effect:Redemption, I know your not playing anything but it's still part of the story and the only way you'll know the events that happen betwen the opening scenes of Mass Effect 2 and the main game.
They're a really good read and you should be able to pick them up for around £10. Or if you have an iphone then you'll pick all 4 up for around £2, which is super cheap and well worth the money if you want fill in some gaps of the story.
Also i'd suggest starting Mass Effect 2 on Veteran difficulty just so theres a tiny bit of a challenge there.
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