Get to your home airport at least 2 hrs before the flight to allow time to check bags, get boarding passes, clear security, walk to gate, etc.
Liquids/gels greater than 3..4 oz are not allowed through security.
http://www.tsa.gov/311/311-carry-ons.shtm
However, once past security, anything you purchase inside the airport is allowed on the plane (water, coffee, jelly doughnuts, etc).
When going through security, you must remove your shoes, jacket, hat, any any metal objects (keys, coins, cell phones, watch, belt buckles, etc). Place these in the plastic bins to go though the x-ray machine.
If you have a laptop, take it out of it's carrying case and place both in a plastic bin.
You will have to walk though either a metal detector or body scanner to check for weapons.
Once you clear security, gather all your items and step aside. Most of the time, there will be chairs nearby so you may sit, put on shoes, and organize your possessions.
Head to the gate assigned for your flight. It may be printed on your boarding pass or you may have to check the monitors for departure information.
The airline will board by assigned groups. Check your boarding pass for this.
Once on board, place your carry-ons in the overhead compartments near your seat. If you have a rolling carry-on, stow this wheels in first to maximize room for other passengers. Other smaller items (hand bags) should be stowed under the seat in
front of you.
During take off and arrival,
all seat backs and tray table must be in the original upright and locked position.

All electronic items with an on/off switch should be turned off.
When you arrive at Orlando, follow everyone off the plane or follow the signs that read Baggage Claim/Ground Transportation. There will be a short monorail ride from the gate area to the main terminal.
If you checked your bags and used the Magical Express yellow tags, proceed to the Disney's Magical Express Welcome Center in the Main Terminal Building, B side, Level 1. Your luggage will be collected by DME and delivered to you room.
If you are arriving after 10pm, or did not put on the yellow tags, you will have to claim the bags yourself and carry them with you on the DME motorcoach.
HTH, Steve