Or tease them to consider an action that they wouldn't otherwise. That's all there is to it. Not who you are. You have a few choices at this juncture. If you're running a small operation, chances are you'll have to do it yourself.
Larger companies can avail themselves of advertising agencies and sales promotion houses.
Even larger companies will usually have in-house departments that do these exercises in conjunction with outside suppliers and advertising agencies. The biggest part of the decision to advertise is to define what you want to accomplish. That should shape the headline, body copy, and any illustrations. The ad should offer customers a benefit to help you with that goal. I ran it twice altogether.