Help: Free Member Registrattion

Hey everyone! Thanks in advance for helping - I have a simple BuddyPress question regarding the below site.

http://www.da77as.net

All I'm trying to do here is set up a forum site for people who live in downtown dallas.

My main conondrum is:

I want to set up membership registration to be:

Register with basic information
My site sends an auto-response verifying email
Registrant finishes registration and can then post on the site.

Am I missing something that's really simple?

Thanks in advance!