Help: How do I build a directory of businesses in my city?

I own a few very good domain names for a great B2B and B2C industries, ending with .NYC (I live in NYC).

I want to build a directory of businesses where I can both enter businesses listings and also people could eventually make their own entries.

I am not a programmer but I am well versed in WordPress and in the past, I have used Joomla and Drupal. And I can do some IT stuff

Any ideas on how can I go about doing that?