If you want to make multiple copies, here is a hint that I use when making multiple copies for a paper foundation pieced project.
First you need at least one master copy of your pattern for each five or so copies. Next, I take about five or so pieces of paper and staple them to the master.
Now I take the stapled packet to the sewing machine. I remove all of the thread from both the top and bobbin. Nest, sew on all of the lines you need to transfer. (For paper piecing I also sew on the outer cut lines.) I often use just a regular stitch length to do this.
Once all the lines have been perforated, a can remove the staples. and then I remove the bottom perforated copy and can write any information I need to on the corresponding sections.
Since you need to start with a larger square of paper, you might want to look at using a pad or roll of newsprint. You can cut these larger pieces into a 12 or 13 inch square. I use a rotary cutter that is designated for cutting paper to do this.
Hope this makes sense and helps.