I do this professionally - email, web site development, creative wireframing, integration, etc.
For your project, I would create and customize several autoresponder email campaigns (using whatever email service provider you currently use, or migrate you to a new one like mail chimp), and write original copy. I would like to see if we can implement different tier levels of membership or monetize membership a bit which we would use email as the main acquisition tool.
I would want to highlight what's unique about this dating service versus other ones. I'd want to do a brand new landing page which we would drive cold traffic to from media buys to stimulate growth. These are just a few of many ideas I have. We would map out some creative assets like display banners to use for acquisition and we'd optimize to a CPA.