For bulk scraps like you have, I would pick a couple of patterns and cut to kit those. Whatever does not go with what you are cutting keep as is for now. When you have a good start on the cutting start sewing. I too use a version of Bonnie's Scrap User System and it is great to be able to pull from my pre cut fabrics to start on a quilt but I know from year's of scrappy sewing the size of pieces I use most frequently.