Save the details for the sale. Keep it simple. The proper design of your sign is critical to its effectiveness. Crowding the sign with too many words or lines of text makes it impossible to read from a distance. Use as few words as possible so your signage is legible.
Fewer words are better, and three to five words are optimal for quick readability.
There should be something about the sign that will reach out and command attention. Ideally, the first read should be a large pictorial graphic or your company logo, but it can also be large dominating text. Your sign is your handshake. Your sign is your handshake with the buying public, and first impressions are lasting impressions. Your sign must project the image you want the public to have of you.