Speak to his aspirations, interests, and strengths. Your dream employee will probably not know of your business. He will not recognize the job you detail. You can, however, be confident that he will recognize himself when that is who you describe. He will see himself in the words you choose, the actions you prescribe, and the admirable traits you require.
Questions are the answer.
There's nothing more irresistible than a question. I doubt it. If, in your classified ads, you are willing to ask for exactly what you want, you will probably get it. By raising the bar and challenging a prospect to answer your questions, you will weed out the losers and energize the winners. When your future employee reads a description of herself in your ad, she will feel like she's looking into a mirror.