Lots of good advice given.
I always put all my pocket stuff except my wallet in my carry on bag. Never check anything valuable.
DO NOT make any jokes about bombs, terrorists, weapons, crashes etc. It will get you arrested, even if you are joking. Don't even think about making any comments or jokes about that stuff.
You can use computers or other electronic devices on the aircraft after they announce it is okay, and that is when the aircraft reaches 18,000 feet. No cell phones in the air at all. ON the ground, they will tell you when to have them shut off (turned off completely, not just hung up), and when you can use them again.
Your luggage should check through okay, but make sure you ask when checking it.
You should always be able to ask an airline customer service agent, or gate agent about where to catch a connection, and if necessary to change terminals, how to get there.
In the security check, I always take off my shoes and belt, run them through xray with your jacket and carryon stuff. Saves time and hassels in the end.
Have fun, relax, your plane will not crash, and when served a soft-drink, ask for the can.
dago