Welcome to our community!
We're excited to hear that you're planning your northbound hike on the AT. We have a group hub we would encourage you to check out as you prepare for your adventure: Appalachian Trail Hikers. There are lots of folks sharing tips and information about the AT there. You can click 'Join Group' from that main page and get updates when other folks post there.
Hopefully this helps, we're looking forward to hearing more about your trip!
You don't mention if it's your first backpacking trip or just a first attempt at a thru hike. If you're new to backpacking, I highly suggest getting all your gear together and taking several backpacking trips prior to setting out to test everything. It's much easier to swap out gear while you're still at home than it is to do on trail.