The braided technique is going to start to work best when you have a triangle shape but you can start with an oddly shaped crumb and build it up to a triangle shape if you like.
It doesn’t matter which side you add your second scrap to first. Just find a straight edge on your first scrap and add a second, right sides together.
Each time you add a new scrap make sure to press your unit with an iron before adding the next scrap.
Now take another scrap and sew it to the opposite side of your triangle (ish) shape.