My first flight alone?

I am going to another state for vacation and since I couldn't buy the tickets online 'cause I wasn't old enough, I asked my boyfriend's sister. She bought the ticket under my name and we have the itinerary number. Is that all we need on the day of the flight along with id, passport, etc? Or do I need to go ahead to the airport and ask them to print out an official ticket?Thanks in advance for the help.