hey there buddy, ok. first off, what kinda vid card do you have?
ATI or Nvidia.
I have a dual monitor setup, and this is what i have
Dell 22'' widescreen (main)
LG 19'' (Secondary)
I have an Nvidia 8800 GTS 640 mb card
now. I connected my 22'' first, set it up the way of the resolution i want.
then i shut down
then as its shut down, i connected my LG
turned the computer on, and went into my nvidia control panel
i had the control panel set them as individual monitors.
and yes you can set them to the resolutions you want.
and then when im done, i restarted. and as you said your main turns on first, then my 2nd
hope that helps.. with ATI i dont have an ATI card, but im sure if someone does, they can help you set up the dual monitor.