When you arrive at the airport you will first need to check your bags. You can use curb side check in, outside the gate will be sky cabs (airport bellman) they will check your bags through to Orlando for you. If you use sky cab its customary to tip @2.00 per bag +/- (IMHO totally worth it)
If you don't want to tip or use curb side enter the building and get in line to check your bags.
During the bag check-in you will be instructed as to what "gate" your flight is depating from. The gate is the place where the airplane leaves from. The airport is very well marked so you should have no problem finding your gate.
You can use your stroller for your dd if you like or check is as luggage. I suggest you just keep her in it for use in the airport. I also advise taking everything possible off prior to the flight and putting it in your checked bags. The canope if it can be removed, cup holder bar and any toys. Use it stripped in the airport and then re-build it later.
You, dh and dd then proceed to the gate, prior to which you will have to clear security. There are lots of posts on the transportation board about how to clear secuirty so I will be breif here as I know you read there.
You will want to take off belt buckles, cell phone, take carkeys and change etc out of your pockets and place them in your carry-on. You will need to take your dd out of the stroller so don't have the basket loaded with stuff. You will have to place everything including the stroller through an xray type machine with a conveyer belt like at the grocery store. If you have shoes or thick soled sneakers you may want to remove them as well. You walk through and if your dd can't walk you can carry her then have dh come through. Collect your carryon's from the belt and head to the gate.
At the gate you should approach the desk and tell them you would like to gate check your stroller. They will give you a luggage type tag to attach to the stroller. After that you don't have to do much except listen for any possible announcements and as the flight time gets closer you may want to line up in the preboard line. Its very well marked with signs and queues for A, B,C pass and preboard. If its you and dh with your dd you can all preboard, auntie, nana and the friend you just met don't count, JK
When you board the plane you can leave the stroller just outside the door. I highly suggest folding it as you normally do and attaching a bungie coard to make sure it dosen't open. Most damage occurs when a stroller opens and the baggage handlers don't know how to close it. Making sure it stays closed and taking off the accessories takes care of most stroller issues.
Board the plane, take the first row you see and settle in. In your case I would take a middle and aisle so you can get up if needed. Your carry on bags go under the seat or on top in the bins. Make sure you have a few things for your dd like a sippe or bottle in the seatback pocket of your seat as you won't be able to access your bags during take off or landing. I would take the middle and asile in case you need to get up
If your dd likes the spill proof cups they are ideal for takeoff and landing as the sip and swallow or chew and swallow is great for the ear pressure. This is the reason many chew gum. I would suggest having some gerber graduate fruit chews or other chewy snack for your dd (if you allow that) in case your dd' isn't thirsty.
Then enjoy the flight, depart the plane follow the signs to ME and start a wonderful vation.
TJ