I think the advice of bringing things with you for the kids is always a good idea. Bring books, snacks and make sure the baby has something that he or she likes (favorite blanket, crackers, toys, etc.)
When I traveled with my boys now 4 and 2 I always liked to sit in the very back of the place or in the emergency exits (more room). That way I don't have to constantly keep them from kicking the seats in front of us.
The worst part for me is going through the metal detectors with the baby. We had to recline the stroller and put it up on the belt, take off all our shoes (including the baby's) All while still holding him. We always got the boys their own seats so then when we get on the plane the seat needs to be attached into the airplane seat (which is always a pain) It seems like we always have a long line of people waiting impatiently for us to get done (LOL)
And they will ask you if your car seat is approved to travel in an airplane. There is posting on the carseat that says so.
Hopes this gives you some idea of what to expect.
Good Luck!!