Room size and speaker position

i'm turning one of our spare bedrooms into a 2 channel listening room. i'm using a Cayin TA-30 integrated with Def Tech 2004tl's. it's 13x12 and i've been playing around with speaker placement, but was wondering...

1) Should i place the setup against the long wall (13) or short wall (12)?
2) how close can i be to the speakers? i heard ideally the speakers should be way out in the room.

I have nothing else in the room except a chair and a lamp....