You need to buy batting that is approximately 2" longer on all 4 sides of the top and the same for the backing. You need to sew the backing to fit the quilt. I go to my local quilt shop and she sends mine off to a great gal to machine quilt them. I put the batting, backing and front all in the bag, not already sandwiched together. That's the quilter's job. At least where I have it done. It's very simple. This is a good community to ask questions. Everyone here is so helpful. So ask away. And welcome!!