I ended up not using the yellow burlap. I cut triangles out of chevron burlap, and punched holes in two corners using a hole punch. Then I threaded jute string through, so the the string was behind the flag. I knotted between each flag once. Then I cut out 4 "boo!!"'s from the jute ribbon. I stapled the "boo!!" on up high with the string to help everything stay in place.
I realize I have one that has the pattern going the other way! So you guys can learn from my mistake! Maybe it will bug me enough to fix it, maybe not!
Happy Halloween!