you could start by trying adding something like this in your --> Section "Device" <--- in your xf86config file, right under where it says Driver "nvidia"... of course you will have to change the horizontal and vertical refresh rates to suit your second monitor, and also remove NULL if you want the resolution following it.
Option "TwinView" "true"
Option "SecondMonitorHorizSync" "31.5-86"
Option "SecondMonitorVertRefresh" "60"
Option "MetaModes" "1280x1024,1280x1024; NULL,1024x1024; NULL,800x600; NULL,640x480; NULL,640x400; NULL,512x384; NULL,400x300; NULL,320x240; NULL,320x200"
Option "TwinViewOrientation" "RightOf"
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