Toe-In should be set by the service manual. The front tires closer to each other at the front than the rear, but it's usually not visible.
They are only "toed in" enough so that the tires spread out to paralell once they start rolling.
For camber, they look ok, or at least are at good starting point.
Since there is no factory adjustment, there is no factory setting (I know you have aftermarket adjustable arms, I do too).
However, I am a woods, trail, and pavement rider.
I have never ridden in sand, and am unfamiliar if they set up the front end any differently.
Rider weight affects suspension sag, and the laden sag will affect your baseline camber setting.
I think that the trail setup, which is measure, ride, adjust, measure, repeat; would be the same, or a very similiar, trial and error initial setup. With fine adjustments after.
Please update your thread as you progress. I'de like to hear what you end up with.