you can use fleece on one side and flannel on the other, and put it together like any raggy quilt with your 'sandwich' squares with the edges (up- seams) then if you are only using one layer of flannel, or no batting you do not even have to quilt each square. that part is your choice. then when it's together clip your seams. the clipping part is necessary, that's what lets the flannel (rag) if you do not clip them it will just string/fray. my kids love flannel/fleece raggy quilts they are so very soft and fluffy! if your flannel is lightweight/ lower quality you will want to prewash it and dry it in a hot dryer before using it. the fleece will not shrink or fade so prewashing is not necessary. i always use pretty expensive flannels and seldom prewash them for raggy's; i just wait till the whole quilt is washed. but that part is up to you only you know what your flannels are. once you make one you will want to make more :)