I am making a quilt top for my BIL and have found a beautiful fleece panel that I would love to back it with. When doing this, do I need to layer anything between the cotton pieced top and the fleece backing? Also, do I need to tie it or can it be fmq? I have never done that, always taken out but do know how to tie. I just don't want it to get too hot or too heavy. Thanks for your opinions.