Ok, i am really just beginning my knowledge of quilting. I really like the look of the rag quilts i've seen and want to make one myself.. am i right to understand that the top quilt block, the batting and the backing are sewn together by blocks? that you really don't add the fluffy batting like you do on a real quilt, but instead use flannel? and you really end up with a reversable quilt? What's the best fabric to use for the top and backing?