I'm not what one would strictly refer to as a chemist, but I did get a little chemistry as part of my military training. For what you are trying to do, you need to put all of your reactants on one side (sugar and yeast, though I am not sure how to include a biological process in a chemical formula) and all the products on the other side (alcohol and CO2). If I had a take a stab at it, I'd do it like this:
Hope that gets you at least pointed in the right direction. Cheers.