Ok, Ok, I know, I have said many times that I don't shoot people, but, I have been browbeat and reluctantly agreed to do an outdoor photoshoot for a family friend and his family.

Here is the plan:

Outdoor shoot, Desert foreground and mountain background
family includes Mom, dad, two teenage boys and a baby girl

What I plan to use:
7d, 50 1.2L, 100L, 500L
4 flashes (1 580 and 3 430's and stands)
1 umbrella
enough pocket wizards and wire to remotely fire all flashes

My current plan:
I would like to try the 500 and shoot from a distance----I think the look of the compressed mountains in the background would be different and unique. If it doesn't work, I can always go to the 100 or 50

My questions:
1. Would a softbox be beneficial outdoors
2. What other gear do I need to do this right
3. Is my plan a good starting point
4. What on earth do I do now?????

As always, Any assistance, advice or recommendations are appreciated