Just moved here from Clayton county, where do I need to change my car tag and get my driver's license switched over to my new address? And do I need to bring?

Thank you! And does Barrow County require car emissions?

You can go online and do everything. The drivers license office in lawrenceville requires proof of residency-lease, utility bill or something in your name with your new address and you have to change your address on the license before they will change your vehicle registration.