Look back a few pages to where I posted about it yesterday or the day before. There were some cute videos of a little Yorkie Eddie going through a home course and the class course.
I just did a search for Agility class Atlanta and found some. If that doesn't work you can try dog training facilities.
Welcome to USDAA should be able to tell you about local places if the search doesn't work.
Good luck! We are really excited to get started.