Display ads involve some design and artwork. Your newspaper advertising representative can help you with this. Or you may want to pay for the service of a professional advertising firm. Classified ads appear in the classified section and are much cheaper. Both types can be effective depending on your product.
Many magazines reach specialized audiences.
Placing an ad, though expensive, in the right magazine may be all the advertising you ever need to do. There are local, regional and national magazines. Many offer both classified and display ads as with newspapers Portfolio. Put together a collection of your best work. Many people take photographs of every project.