Advertisements must be professionally designed and printed.  Avoid printing at least 1” around the border of the sign to leave room for the sign to fit in the frame without covering up the advertisement.  Use materials that inhibit the absorption of water, as these signs will be exposed to different elements of weather.  Be sure to paint both sides of the sign as well as the edges to prevent swelling of the sign in the sign rack.  Both sides of the sign can also have printing on it, then they can be flipped every so often for a new look.  Price varies according to the sign company chosen, as well as materials preferred.  The sign specifications are = 72” wide x 21” high and 1/8” thick maximum or 66” wide x 21” high and 1/8” thick maximum