Backgrounds Chroma Key

Backgrounds Chroma Key
Chroma Key Lighting...?

I am going on location (indoors) to shoot someone in front of a green screen. I'm purchasing a portable chroma key set, but am wondering how many lights I need to have. I already have two 850w softboxes, and a 850w barn door light. I know that good lighting is key to have a good shot when it comes to green screens, but just don't know how many and where to set them to get the best results.

So how would you light up a person on location and their background chroma? How many lights would you use (at a minimum since I can't buy like 10 of them), and where would you point them?
Thanks check_it_out. I also thought I might add that the size of the chroma would be around 10x10ft, with the whole person showing.

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