Regarding lighting and light control, there is a vast tome of literature on that subject, and web pages (and even web sites) dedicated to it. Find a book on basic lighting, or check websites dedicated to independent video production, etc. We've also discussed lighting here, but not in the detail you'll find elsewhere.
I've not had the best luck finding models, but you can check places like
onemodelplace.com and
modelmayhem.com. You can run an ad on Craigslist. You might be able to solicit on
fetlife.com ... not sure about that one. Finding enthusiastic WAM models is no easy feat, in my experience.
You should be upfront with your model about how they will get paid. I don't think a profit sharing arrangement would be fair to the model unless you have an established track record and a trusted 3rd party to keep records. You should scrape together the money to pay your model the first time, in my opinion. You might find a model to do it pretty cheaply, if she enjoys it and you don't expect her to get naked, or perform sex acts for your camera.
Best of luck.
The mud-bondage guy