what should i set my video setting to?

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Hi everyone, I just purchased a new laptop for gaming on, but I'm not terribly good at getting the most from it to make my playtime in planetside the best it can be.

The laptop is an alienware m17x
windows 8 64bit
intel core i7 3610qm 2,3ghz
16gb ram
nvidia 675m

I'm wondering what I should set my settings to to get a good FPS, and still have the game look nice.
One thing I notice is that there is a lot of dust/smoke/snow that makes it hard to see..but I'm not sure if that is something all players experience or if having that stuff turned on is a disadvantage against players that turn it off.

Any suggestions for improving my experience while not losing too much eye candy would be appreciated. I seem to get about 50-60 fps with stuff set to medium/low.

thanks again guys.