Calculate subject to background distance. get your lights close to subject and move them away from bg to get black look. 85mm f8 160/1 (can go faster to kill all ambient light on bg)
1+2
1. camera right, beauty dish + 20 degree grid. dis 2 feet
2. camera left, behind subject, strip soft box light + grid dis. 3 feet.
3. camera right, behind subject, snoot to light weapon. dis. 5 feet.
range from 1/8 power to 1/4 power between 3 strobes.
White background is easy, background light to wash out bg, then light your main subject using another light with large light source.