Great start into bonsai. Starting here puts you a few years ahead of starting with $10 HD nursery plants.
It needs to stay outside, and is fully hardy in GA. Full sun, all day. it will need water every day in a GA summer, and I would spray for spider mites every month or so, but have not experienced any fungal issues with itoigawa.
Repotting next year may or may not be necessary, but your time for repotting is March, not summer. When you do repot, it would be good to plant it a bit deeper in the pot so the soil covers the roots, and is not mounded.
Wire comes off when it is almost 50% embedded, and it looks like the apex isn’t wired, but the lower branches are. Is this correct? If so, this will quickly create an imbalance with lower branches getting weak and the crown getting too strong. You might contact one of our GA members for an assist.
@Adair M knows a little about wiring If you’re in NGA.
For now, you can keep the moss off the trunk with a toothbrush, and you can treat deadwood with a diluted LS solution now. Also, feel free to remove foliage growing down to keep the undersides of branches clean and sharp.