Where to place speakers ?

[sumik]

Hello, so I finally ordered Onkyo 606 and Polk RM6750 to get some better sound than the one comin out from the TV. But this being my first speaker setup where do I put the speakers ? I guess front on the sides of TV, center underneath it but what about rears ? I included some pics of my bedroom where this is gonan get installed, do I go very top or middle or right beside my head ? Do I place it pointing down or just pointing towards the Tv ? I know this is very cheap setup and maybe I shouldn't b asking question like i'm installing professional system but maybe it does make a difference how I place it. And the sub do I place it pointing towards me ?
here's pics of my bedroom, plasma is 46" .