The virtual school you're looking at isn't homeschooling; it's public school at home. It's not something I recommend. You can buy K12 on your own and do it, and I've heard good comments about that. It's the governement-funded virtual school I cannot recommend.
Private homeschooling will give you the most flexibility.
I also don't recommend doing all ABeka. Individual subjects are fine, but doing the whole thing...no.
Here's the link to Home School Legal Defense Association's analysis of GA law. My very strong recommendation is to join HSLDA before you take your dc out of school.
GA has a big homeschool population. You'll find links to organizations on HSLDA's site, too. It would be good for you to connect with local homeschoolers as soon as possible.