If you haven't flown in a while and you are a terrified flyer, it is understandable that you feel anxious.
You are smart to ask what you need to know because if you don't have a clue, it will be harder to give your children a good experience.
Keep in mind that flying is still the safest mode of transportation and that many people fly weekly or even more often. It becomes as natural as breathing when you fly often.
As safety mom said
check out AA's website for any pertinent info
click here for American Airlines web site and
click here for Transportation Security Administration web site
Other tips:
You will pack lightly, if possible, and the fact that it is you and 2 little ones helps because their clothing is smaller.
Check out your destination airport for weather reports and use the forecast as a guideline for packing.
Click here for MCO web site
You will probably need 2 medium suitcases if you are able and willing to do laundry while away or if it is a shorter trip and a carry on.
For our family of 4, we use 3 carryon size suitcases with wheels (which we use as checked luggage, one for each adult and the kids share one) and usually one duffle bag style carryon which has our toiletries, medicines/first aid (motrin for adults and kids just in case, bandaids, sun screen,etc.) a folder with our travel itinerary, reservation numbers, directions, etc.,
And I carry a large straw purse (with my regular size purse inside which holds our air ticket or conf. # , drivers license, credit card, cash, etc) This straw bag accompanies us to the pool, on side trips, etc., and holds sunglasses, camera, snacks and any other items you may need at pool, beach, side trips, whatever.
You can throw in a few snacks and also pullups/wipes in a ziplock if your little one isn't completely "potty trained".
Make sure that your kids use the bathroom after you have checked in at the airport, if possible, and again before retrieving your luggage at MCO if need be. That way you will be holding less luggage that you MUST keep in your control at all times and hopefully will save you a bathroom trip on a crowded plane.
Check out the TSA website "tips for traveling with children" so that you will know what to expect when passing through security. If you do not have seat assignments, or if you are not sure or just need reassurance that you are in the right place, check with the personnel at the gate desk, if there is one.
Then sit and wait until you are called to board. If you have a car seat that is approved for air travel (it will say so on the car seat) you will hopefully be able to preboard. The car seat must go near the window on a plane, as opposed to center or aisle seat. If it is not approved for air travel, it becomes a carry on or checked luggage. I am not sure off hand about the stroller. Its been years since we have needed one, but I think we checked it.
If you have arranged transportation from MCO check out the website of that provider. MCO is a busy place, but there are plenty of signs and it does all make sense if you are calm and level headed.
You can always find someone to help you. Keep your kids in hand and instruct them to stay with you and what to do if you become separated, which is unlikely.
Enjoy your trip!