An LLC is a useful first step, both for liability and for accounting. As noted, good insurance is a far better liability protection than the LLC, but I find the LLC useful in keeping my books separate. Anyway, the process of getting up and running as a landlord in Georgia isn't super complicated.
Step 1, form the LLC (done!).
Step 2, open a bank account (you'll need an EIN, which you can get online from the IRS at this link https://sa.www4.irs.gov/modiein/individual/index.jsp.)
Step 3, sign a deed of your property into the LLC. DO NOT USE FORMS YOU FIND ONLINE!!! Different states have different rules, and saving a buck here is stupid. Literally any closing attorney you know will take care of this for you for $150 bucks (I know, because I do this for my clients).
Step 4, If you will be self-managing, get 3 documents ready to go: a lease, a deficiency notice, and a non-renewal letter. These aren't that hard, and I guarantee that the closing attorney who prepares your deed will be able to prepare these as well, or send you to someone who can. (again, I know this because I do this for my clients) Eventually you will probably want to get more detailed, but start with the basics.
Step 5, once any necessary renovations are done (that could be its own thread), either start posting ads to get applications, or start interviewing property managers. If you are going to be significantly cash-flow positive, given that the mortgage is paid off, I'd lean toward hiring a manager. I've done self-managing, and had managers. A bad manager made me want to never use one, and self manage everything, and then I found a good manager, and I've never looked back!
Don't be reluctant to talk to attorneys. The things you need are very formulaic, and most competent real estate attorneys can do these very cheaply, in the hopes that if you ever have a "more expensive" need, that you'll contact them for that, too.
Congrats on getting up and rolling, and best of luck!