Check out the blog called ThatQuilt. It is a Dear Jane tutorial blog but she has a great method for paper piecing using freezer paper. There is a link to it on the blog, look down the right side of the page. I love this method! The way you get a straight fold line is that you gently score the lines (use the dull side of your seam ripper) before you start sewing. The lines are then straight and crisp. You don't have to stop sewing at the end of each line. The freezer paper helps stabilize your fabric, especially small pieces and bias edges. Excellent method!!