Think this is already covered but:

Do I need to touch my luggage?
- no (check your luggage tags to make sure you are checked through to destination)

Do I need to clear customs?
- no

Do I need to go through security?
- only if you accidentally wander out into the terminal landside

Do I look for a sign that says "international connections"?
- yes (you will go through a couple of brief boarding pass/passport checks along the way to the international side)