How Do You Navigate ATL Airport When Your Getting There && Have a lay Over Till Your Next Flight.?

HELP. Im Scared. Im 15 && a First Time Flyer && i Will be Alone.! Im Going From Florida to Georgia(For A Layover) Then To Missouri.! What Do i Do When i Get to ATL From My First flight How Do i Find My Second Plane? HELP im Scared ill Get Lost or Confused.!