Stretching from Florida to Greenland, the Atlantic Flyway contains all of North America's Atlantic Coast. Many birds that use this flyway winter in the Caribbean or South America. To the east, it is bounded by the ocean, and to the west it is roughly flanked by the Appalachian Mountains. However, these borders aren't exact; many “tributary” routes branch off of the Atlantic Flyway, with some birds flying across open ocean or taking journeys that intersect with the Mississippi Flyway to the west. https://abcbirds.org/blog/north-american-bird-flyways/ 

Check out live views of where birds are migrating right now in the US by state at Bird Cast: https://birdcast.info/

Identifying what birds you have on your backyard is  good way to start birding: https://www.youtube.com/watch?v=pEXX6Oyuj4k. Listen to their melodius songs and start identifying them.