Jeff,
As a commercial shooter who has many thousands of dollars worth of fancy lighting at his disposal, let me say I think you could actually do really well with nothing more than North light and a reflector. It will allow you to simplify your approach and really focus on the image-making. I'd get 2 rolls of seamless paper, 1 grey and 1 white in 4 foot widths (they're cheap). Place the background as far from the flowers as your space permits.
Links to paper at B&H White Charcoal
These are just suggestions, get whatever colors or shades you think may work well.
Lastly, I'm not sure If I posted a link before, but here's a recent blog post I made about my setup.
HTH,
-CB
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