You can display it on a bulletin board but consider the thickness of the corkboard. The thumbtacks should not pierce the board and then go into the wall.
Fold the edge of the material loosely over the handle and pin the material in place. Remove the handle, then you can use a sewing machine or some fabric glue to secure the material in place. Sew or glue the top of the pocket together, so the handle cannot slip through. This will allow the flag to sit on top of the handle.
If you are making an American flag, for example, you would need to cut a small rectangle from a piece of blue fabric, seven long stripes of equal width from some red fabric, and a collection of five-pointed stars from a piece of white fabric. If you want to spell something, such as “Go Team!”, you can draw bubble letters and cut them from a piece of white, black or colored fabric.
Once you have decided on your measurements, cut out a template flag and use it to cut out the rest of the triangles - how many you need will depend on how long you want the banner to be. You can use an Exacto knife to cut paper instead of scissors. If you want to add a little something extra to your flag banner, try cutting out the triangles with a pinking shears. This will give them a zig-zagged edge instead of a straight one!