I don't believe in reinventing the wheel. There are so many good tutorials on how to make piping. This video series is my favorite. She is extremely thorough! She has over 100K views! She can do a much better job explaning all of it and showing you....If you prefer a step-by-step in pictures, go here
After making a perfect square, and one cut on the bias (if you don't know how to get to this point, go here), mark the fabric
Cut the fabric
Lay out the strips together
Join the strips together
Insert the cording and sew the fabric. Note, I do not have a piping foot. I use a zipper foot...it works just fine!
I am extremely impressed with her speed. I am a much slower sewer. Did this help you? Would you try it?