I made two different batches of filling. Both involved searing finely diced tofu, cabbage, onion, and celery; seasoning with white pepper, soy sauce; and adding a bit of cornstarch dissolved in cold water to firm up the mixture.
To construct the wontons, I just followed the instructions on the wrapper packaging. Drop a bit of filling in the center of the wrapper, fold one corner to the opposite to make a triangle, fold the other two corners to the center of the triangle, about 1/3" from the edge, dip the ends in water, and pinch them to seal (the dough seals very easily...unlike homemade ravioli.)
I arranged the finished wontons on non-stick aluminum foil, so that they would be easy to remove once the were frozen.
I tried both boiling and frying the wontons, and both methods of preparation were delicious.