First studio job, lighting help

Hi there. I have my first studio job soon. I need to shoot a group of 3 then a head shot and a 3/4 body shot.

I have 1 580EX and 2 430EX with 2 shoot thru umbrellas. I need to make it work with what I have.

I need suggestions on how to light and placement.

Thanks

Is this job for friends or paying customers? i'd suggest practicing with 3 friends and learn how to do it before getting studio work with clients who might get a little p*****d off waiting around while you try things out. sorry to be harsh, but i wouldn't pay for that.

how do you plan to trigger the lights ?
if you got radio, the problem is easy.

580 - main, fill light 1/2 power
430'z as key light from left and right. 1/4 power or even 1/8
shutter 1/125
f6.3 - f8
iso according to a good exposure.