Strong monofilament line is required if you will be placing the decoration outdoors. Balloon Garland for outdoor use can be tied to porch rails, trees, fence, etc. We use 3M removable hardware for indoor use.
Link-O-Loons are also great for air-filled balloon garland. Each balloon has an elongated tail at the top to tie to the next balloon.
We carry all of the products mentioned individually as well as in our do-it-yourself decorating kits at http://www.celebratetheday.biz/ . If your event is in the Nashville area, we are available to decorate for you. We setup balloon decor in Franklin, Brentwood, Antioch, Nashville, Smyrna and Murfreesboro. Is your venue in another city? Just send us an email or call with your party details. It's probably not as expensive as you think.