What you say in advertising is more important than how you say it. - David Ogilvy

First, study the product you are going to advertise. The more you know about it, the more likely you are to come up with a big idea for selling it.

When I write an advertisement, I don’t want you to tell me that you find it "creative". I want you to find it so interesting that you buy the product. When Aeschines spoke, they said, "How well he speaks". When Demosthenes spoke, they said, "Let us march against Philip."

Once upon a time I was riding on the top of a First Avenue bus when I heard a mythical housewife say to another, “Molly, my dear, I would have bought that new brand of toilet soap if only they hadn’t set the body copy in ten-point Garamond.” Don't you believe it. What really decides consumers to buy or not buy is the content of your advertising, not its form.