New guy here, so I apologize... but when I was a scoutmaster, we would go camping at V-Bar in Kiln, MS all the time. I believe they rent out cabins, but also regular camping areas to the public. Beautiful lake, hiking trails, dirt roads everywhere, shooting range... worth looking into. (I'm not 100% sure they still do public reservations)
For simple camping practice runs, you can always check out the state parks like Percy Quinn in McComb, Bogue Chitto in Franklin, etc.
Looking forward to getting back into camping soon! I'm in southern LA, just southwest of New Orleans.