Hello! I'm not sure if I'm posting this in the correct place, so if this topic is meant for another area of this forums, please move it if you are an admin.

In about two months, I'm flying to South Korea, where I will be for 88 days. However, I've never flown before, so I'm a little anxious about the whole process (even though I've looked it up over and over). My flight is a multiple airlines flight that involves flying from Atlanta to Phoenix on US Airways, then from Phoenix to San Francisco on US Airways, then from San Francisco to Seoul on Singapore Airlines.

I've already received my passport, and I don't need a visa, so are there any other official documents I should bring to the airport?

Also, when I first arrive, what should be my first step? I plan on bringing one suitcase and a backpack (which I've heard I can take on the plane). Should I obtain the boarding pass as soon as I walk in? If someone could tell me the steps of what to do at the airport, it would be greatly appreciated!

Furthermore, because the flight is multiple airlines, do I receive the boarding passes for all flights when I first check in at the airport in ATL? Or do I also have to receive a boarding pass when I check in at Sky Harbor in Phoenix? Or when I switch airlines at SFO? Thanks.

Also, I've heard that if the flight is run by the same airlines, I don't need to exit the terminal. So what should I do when I arrive at Sky Harbor in Phoenix (because US Airways takes me from ATL to Phoenix and from Phoenix to SFO).

These are the only questions I have for now! Thanks so much for taking the time to read this. Again, I apologize if this thread is in the wrong spot. Have a great day!