Text of advertising message for distribution

We need a specialist in writing advertising texts. It is necessary to write the text of the advertising message for distribution to the Internet users of St. Petersburg by e-mail. The provision of car service services will be advertised.
The volume of the text should be not known, so I am looking for a specialist in writing advertising texts specifically for e-mail newsletters, who knows what should be the volume of text and how to write such texts.
I'm waiting for you to offer.