You have more than enough at your disposition. First i would say to iron out that sheet to remove the possible shadows caused by the wrinkles. What kind of umbrella do you have? Is it shoot trough or reflector type? It does make a difference for the positioning of your lighting. I would put a light to the side of your model and point it to the sheet close range, to light it up brightly in a difuse matter witht the umbrella to make the sheet very white and place the other light on the other side pointing at the model a bit further away to eliminate the possible shadows on the sheet. The way you are going to light up your model on this side depends on what you need to acheive as a result. Is it going to be a direct lighting, are you using cookies? will you use a Gell to warm up or cool down the colors? Will you use an umbrella that is reflective or shoot trough. Play around with your gear is my best advice and share the results with us.
I hope i helped out a bit.
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