After you birth the quilt I suggest you smooth it out, make sure the front and back line up and then pin it and stitch a few lines about 8-10" apart horizontally through all layers. This will keep the front and back layers from shifting. Just make sure to smooth to out so you don't have puckers. Then I would top stitch the edges, I'd do the edges last because when you sew the lines horizontally it's possible the fabric will stretch. So if you top stitch it first you will have a big pucker at the sides.