Welcome from Spring, Texas. I think Tartan gave you some great tips. The first thing to know though is never "iron" pieces for a quilt. Press - which means drop the iron down and let it sit for a sec. Don't use the traditional rubbing motion. Set it down and pick it up. To flatten fabric, dampen slightly and press each peace. You will immediately see a difference. "Ironing" can easily stretch pieces which will become a nightmare when you piece them into other pieces and once you stitch that stretched piece in - sorry charlie. That should help a lot.