Charge whores a small administrative fee to have their ads, rates, pictures, info, etc. on the site. Charge more for featured whores on the front page or something. Have a separate section for guys to rate the whores that they have found in the area (like a forum). Surround with webcam and dating site ads. Make money.
Spam the URL on Craigslist and other free sites in the Miami area. Make a Sub-Reddit and populate it. Buy some geo-targetted banners/link placements. I would say for less than $1,000 you could get that project off the ground and running in less than 2 months depending on your motivation
Once traffic picks up, start charging more.