You probably just need a few pointers about format and language. When formatting an ad or a sales letter, put the most important benefits right up front. Put yourself in the customer's shoes and ask yourself what the customer will really go for. Focus on that point. Keep your sentences short and simple.
Sales copy needs to be crisp and clean or people lose interest.
With simple sentences you can steer clear of confusion and get right to the point of the ad. Take it a step further in your classified ads and alternate complete sentences with catchy two and three-word phrases. Break your copy into short sections. Professional writers often keep their paragraphs to two or three sentences. This makes your copy much easier to follow.