So... you're going to be paying someone other than Google to get ads, you'll be spending time/money looking at everything everyone writes. Hope you've got a small pile of money you don't want.
As ever with directories, the advice is give up now. Yes, existing directories have their faults and don't do anything particularly difficult technically, but the successful ones are 'good enough' and have the user base you will never have. Have a look at all the people here who have thought they could do better than AW et all, realise where they are now, and give up.
In your case, you could probably do some nice sites for people - concentrate on that, or go straight to being a webcam site. You'll have other problems, but fewer of them.