Personally the only info I want from AW is name, location, rates, telephone number, likes, rating and pictures. All the rest is just fluff. The core service that AW provides is very simple to replicate, it's just a web database application. There are plenty of sites on the web already that just scrape AW profiles and present them as their own.
The point is you could go live with something very simple and build on that.
You'd certainly need the services of a web developer and a web designer. The admin and billing part is probably going to cause you more of a headache. Eventually you'd need full time staff to deal with that.