I have chosen this fabric for the backing of my quilt. It is just over three yards in length because it needs to be larger than both of the front of the quilt and the batting. See image below:
I read it is recommended to prewash the quilting fabric. Here is an image of my fabric being washed because I want to rinse out any extra dye and remove any grime.
Stacking the rows is the most convenient way to lay out your pattern rather than having a giant quilt pattern laid on my floor or table. It stays out of the way and it lowers chance of getting messed up or dirty.