I always wash my fabric and am so happy I do. Each time I look at that dark red/blue/black/green/purple/yellow dye in my kitchen sink, I say "Thank you" to my quilt teacher. I do not iron any fabric until I am ready to cut it. Yes, I definitely iron my seams when piecing, something the same teacher taught me to do. My quilt blocks lay beautifully flat just like they should. Maybe there aren't Quilt Police out there but I think experience from bad results are my Quilt Police. I have never gotten into spraying my blocks with starch or anything, I know some women use 2 or 3 cans per quilt. I think that is your personal choice. I think if you are piecing a queen quilt top in one week, you must be doing something right.