I made up a little free pattern for you to download-just a basic pocket-in women's and kiddo size. You can obviously make them larger or smaller to fit your ginormous or tiny hands.
First thing: cut out 4 pocket pieces using the pattern.
Then on the sides of your skirt or dress panels, place them like so, measuring from the top of the panel so that they are the same.
Then sew the pocket pieces to the side of the skirt, back stitch at beginning and end. Do this for the other 3 pocket pieces.
Then press the seams you just made, and pin the skirt panels together, lining up the pockets. Pin!
Then sew down the skirt panel, and around the pocket like so. Finish your seams, turn right side out, and press the pocket opening.
Tada! Lovely pockets that were a cinch to put in!