Newer machines have zipper and cording feet that make adding these embellishments easy, and even if you have an older machine, just refreshing your memory on the proper threading order and tension settings will make the job go easier.
If you're adding cording, make sure to include it in the fabric sandwich and be careful to use the right foot to get a snug, even seam.
Your sewing machine manual will give you additional information on how to install and use the cording and zipper feet.
This will help you decide later how much fabric you'll want to buy, and how much cording, if any, you'll have to have.
All you need for this game is some black balloons and ribbon or cording.