Essentially for a Pleat board you are going to be making a folding series of pleats in a more heavy duty material. I chose to use a thick sew in heavy weight Pellon interfacing with no glue on any of the sides. You kind of have to use something that has no glue or it will completely defeat the purpose of making a Pleat board since you will be doing a lot of moving and ironing and it would get messy.
I also went overboard and decided to make 2 yards worth of each size pleat. Once again not necessary because if you are doing a long yardage you will eventually be moving the board along either way.
Personally as I do this I use my iron on the highest setting with full steam then use a ironing cloth over the pleats as they form. If a spot is giving me difficulty I lower the steam and do a good press till it holds the shape. Using starch to help it is useless since you will be ironing over these pleats over and over again when you pleat your own fabric.
Now that you have your Pleat board done here are some illustrations from someone else on how to use it! Basically you wedge your fabric into the pleats and Iron it. I like to use a metal ruler and keep it in place and iron over both the fabric and the ruler. The metal ruler helps conduct the heat along the entire length. I also use whatever temperature is appropriate for the fabric being pleated with a lower steam level. As I work my way along I will pin at the beginning of the length of fabric to help keep it from sliding around.
The end result is gorgeous and even pleats. Yes making a Peat board takes a good amount of time but once you have it this is a time saving tool that will give you great results. For my pleats I finished the edges first with a narrow hem stitch like you see on silk scarves, this way I don't have to worry about destroying my work if I need to go back and finish the raw edges.