First of all, you should identify the most visited places in town where a huge number of people come on a daily basis. The major bus terminals, main entrance of shopping malls, railway stations, airports and the busiest roads are the best places for placing the digital signage.
To determine the size of the digital signage display in the most important factor which can affect your advertisement campaign. Always use high definition flat-panel LCDs that could be clearly visible even from a larger distance.
Then you should connect the monitors to the host or controlling computer. You have to use a dedicated computer which will provide unique messages on digital signage placed on different locations.
Be careful in choosing the digital signage control software. Always try to use specialised software like Scala or Navori for the effective presentation on digital signage displayed placed on different locations.
You should install the digital signage software and design the individual slides like billboards with easy to read and short messages.
Try to make the message language as simple as possible and it should also be clearly visible as vagueness can cause damage to your objective.