If your idea is really unique, register the appropriate domain name and common variations / typos before you tell anyone about it.
The best place to start is to learn about existing dating sites, how they market themselves and figure out how you are going to position your own services relative to their services.
If you are looking for a plug-in script, your idea may not be as unique as you think.
As you're starting this idea from scratch, it's premature to worry about your site getting shut down from too much traffic. You're placing the cart before the horse.
Good luck.
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