Since you did not give a lot of information, it's hard to know what your doing. I assume your going to have to splice sheets together, tip to tip, and that you will sheet 1/2 of the wing at a time. Do not butt joint the sheets. True the lengths of the sheets first, on one side. Overlap them and cut at least a 45% splice in them at the same time. Use aliphatic resin (titebond or equilevent) for sanding purposes. Using a straight edge, glue the splice. After the splices have dried, true the other side of the strip.

After you have enough strips, glue them together as RAMFlyer suggested. Do not line all the splices up cordwise. You don't want to create a shear point. As taildrager suggested, if you want 1/16 sheet on the final result, start with 3/32 and you will have some to sand away and still have 1/16 left.

I am not sure why RAMFlyer has doubts about using ammonia. It changes the balsa at the cellular level and allows it to curve duing applicaiton. After is has evaporated, it has no fruther affect. Water works, but not nearly as well. Generally, just shooting both sides with Windex with ammonia works fine.

After the wing halves are joined, or sheeted and finished, I would glass the center section for strength, assuming this is a one piece wing. With a little care and a light touch on the resin, you will never know it was glassed when it's done and it will add almost no weight realitive the the strength it adds at the center. Of course, if it is a two piece wing, this is unnecessary.