I would use old file folders or light weight cardboard to make your pattern. You can get some basting spray to temporariy glue your template to the fabric or use some heavy weight washers or small sand bags to hold in place while you cut with a rotary cutter. You can also buy some stencil plastic at Hobby Lobby to make your templates. If you want to use paper you will have to have pieces big enough to pin it in several places to keep it from slipping.