When I started quilting I just couldn't wait to get my project underway, however I am now more inclined to prepare fabrics. I will wash and iron yardage but as I don't use precuts very often I probably would not launder them before use. I have very recently been persuaded to use starch in my next project as several quilters indicate it is helpful. I offer no advice other than maybe try it and if it doesn't make any difference then go with what makes you happy.