It is recommended to start each project with a new needle.  Microtex Size 80/12 or Microtex Size 90/14 work best; however, Universal Size 80/12 work just as well.  For most projects I recommended 3/8-1/2” seam allowance, 2.5mm stitch length for piecing, and 3mm stitch length for top stitching.  If you are sewing through several layers, you may need to lower your machine’s tension.  Home Sewing Machines can generally handle sewing through up to four layers of cork or two layers of cork and 2 layers of foam at a time. Each machine behaves differently so please test what works best for your machine.  You can iron quality Touch PRO cork on either side (unless it has metallic).  No pressing cloth is needed.