You can just trace around one that you already have,then add seam allowance.

I don't use the kind of batting they use for quilts,rather i use pellon fleece.

No not necessarily,you could just stitch around the edge.or around a figure or something that's on the fabric.

I always wash everything first,i don't like surprises,especially that kind.
HTH
Kathi

PS you can probably google and get a free pattern at one of the sewing sites.