MCO is very erasy to navigate.
Overall, the airport consists of five buildings - a Landside building and 4 Airside buildings where he actual gates are located.
When you arrive, you will be in one of the Airside buildings. From that building you take a short (few hundred feet) monorail ride to the Landside building, or main terminal.
The Landside building is rectangle-shaped. The long sides of the rectangle are called Terminal A and Terminal B, but there are really just opposite sides of the same building. Various important things are laid out in straight lines along these sides:
Level One has ground transportation, including DME, Mears, rental cars, airport shuttles, and taxis.
Level Two has baggage claim.
Level Three has all of the airline check-in counters, the security checkpoints, and the monorail stations to the Airside buildings.
When you get off the monorail in the main terminal, you will be on Level Three. Follow the crowd to the nearest escalator, go down one level to Level Two, and look for the overhead signs that will tell you which belt your flight's luggage will be on. Baggage at MCO is very fast - it will tak only a few minutes after you arrive at the belt for your bags to start coming out.
When you have your bags, go down one more level to Level One. Again, there are signs all over to tell you where to go for your ground transportation option. DME is only on the Terminal A side, but all of the other options (rental cars, taxis, hotel shuttles) are on both A and B sides, so it's easy to find them.
If you are flying in on Spirit, you will come into Airside Bldg 3, between Gates 30-59. On the diagram below, that's on the left side.
Here is the terminal diagram:
Happy flying!