Making your own skin:
For the skin:
2 cups all-purpose flour
1/2 cup water
Mix the flour with water and knead it for about 20-25 minutes or until the dough gets soft. Separate the dough into two equal portions and roll them into cylinders (about 1 inch in diameter). Cover them with wet towel and set aside.
To prepare the skin, cut the dough into 1/4 in. length and use a rolling pin to flatten it until it becomes a round skin about 3 inch in diameter. Put a small spoonful of filling into the center of the skin and seal it up tightly with your fingers. (No pleating is needed for this recipe).
Good dumpling skin making technique!
(Adapted from http://www.tinyurbankitchen.com/2012/01/homemade-chinese-dumplings-jiao-zi.html)