From MIA there are two tricky parts. If you are using Google Maps or Waze, the directions will be confusing and difficult to follow.
If you are renting from any major company, you will take the free train to the rental car center.
Leaving the rental car center, you want FL 836 WEST. That is SOUTH from the rental car center and then RIGHT onto 836 WEST (as in NOT East).
Once you merge onto 836, work your way over to the left two lanes and stay there for several miles until you pass over another major expressway (FL. 826 - Palmetto expressway, which will exit to the right). At least one of those lanes will end and merge right, but stay as far left as you can until you cross the next expressway.
Once you get past the Palmetto, work your way to the right and follow signs to NW 107 Ave and Turnpike. DO NOT follow left lanes leading to 137 Ave and DO NOT exit 107 Ave (two exits), stay on 836.
Once you get past both 107 Ave exits, move to the right lane and stay there. That will take you to the Florida Turnpike NORTHbound. Stay on Turnpike to Orlando.
Tolls have been waived on all Florida toll roads for the duration of the emergency...which will extend for several weeks.