I don't mean this to be smug because I don't know the answer myself and I don't know if it's fully possible ... but since you are in school, this could be a great opportunity to research drag formulas, make some estimations, and then crunch the maths to see what the numbers say. Then it would be especially interesting to build the net system, test fly, and see how well your numbers predicted the actual results. I know there is a lot already going on with your project, but as engineers, it's satisfying to come up with ways to predict the outcome, then test the result and see that your predictions were at least in the ball park. And if the result is significantly different from the prediction, then it is interesting to think on that and try to figure out what wasn't accounted for, or what parameter estimation was way off going into the formulas. Then report back here so we can learn too.

You could also hit this from the practical perspective and start out building something really simple (as others have suggested) that will for sure fly. Then keep track of the power required for level flight and build up experimentally. There never is a single right way to do things, but a systematic and well documented approach will always look good in a final report.