Place the inner fabric wrong side up, top with the batting then top with the outer fabric, right side up.
Pin in a few places or clip the sides to keep the fabrics together.
Do some free motion quilting on the entire surface, except for 1/2" on both sides.
Fold the quilted fabric in half, lengthwise and trim all sides so all layers are of the same size (they move a little during quilting so they're not even at this point).
Fold the sides in 1/4" and press well with the iron on steam.
Sew the zipper
Place the quilted fabric right side out, with the folded sides now as the top and bottom, and fold the sides towards the middle.
Insert the zipper in one side, sandwiched between the folded outer and inner fabrics.
Change the foot to a zipper foot.
Sew the zipper as close to the teeth as possible.
When you get close to the zipper slider, stop sewing, backstitch, lift the needle and move the slider out of your way, behind the sewing machine foot. Lower the presser foot and continue sewing where you left to the end of the zipper.
Repeat for the other side of the zipper on the other side of the fabric. You might find this is a little hard to do so it may help if you open the zipper and sew like this for the most part. You will need to keep the zipper open at least 1" anyway, so you are able to turn the pouch right side out when done sewing.
Sew the sides just over the zipper ends, sewing very slow when the needle passes through the zipper teeth.
Trim the excess fabric at the sides.
Zig-zag or serge the raw edges.
Box the pouch
Box all four corners of the pouch as indicated here, using method #1 or #2.
Zig-zag or serge the boxed corners.
Open the zipper completely and turn the pouch right side out.
Push the corners out and press the bottom seam a little.