Below is an ad I ran over 10 years ago. It's a good example of a simple and appealing advertisement with a single point.
Make a catchy statement that will grab the reader's attention.
This will be the first thing a reader will notice. One single, attractive image. Since this is a shoe ad, this is appropriate. If possible, show people using your products or services. People will then identify with them and you will get more out of your advertising dollar.
Too many price points will cause confusion. You want a single point in your ad.
Logo & Contact
Because it would be crazy not to add this. Of course, everything you do needs to contain your place of business and your contact information. Or you might as well just throw your cash out of a moving car.