Depending on what side of Atlanta you live in can be a big issue as far as associations and games.
I am with Marietta Umpires and am recording secretary. we cover all of Cobb Cherokee, Bartow, N Fulton, Paulding schools.
We would be more than happy to give you more info if interested
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Tony Thompson's group Multi County calls Gwinett area games
Jack Martin group Tara Umpirescovers south atlanta games
Jack and Tony both run Southern collegiate if you are interested in college.
There are a few other smaller assoc. but we are the big 3 and would be more than happy in leading to what would work best for you.
You can check
GHSA.net go to official assoc for contacts and numbers of all associations.
Feel free to contact me if you have any other questions.
[email protected]