I assume you're staying at Marriott's Grande Vista Resort near Sea World.
From the airport entrance to westbound Florida-528 to the International Drive exit, you will encounter two tolls. You can pay by cash. One is $1.25. The other is $1.00. The toll-taker can make change, so you don't need a pocket full of coins. You can ask for a receipt if you wish.
Watch the toll road signs carefully. The cash toll plazas involve bearing off to the right, almost as if you're exiting from the toll road.
If you miss a cash toll plaza, your rental car's license plate number will usually trigger your rental car company's automatic toll payment service, with a associated "convenience fees." Depending on your rental car company, you could pay a substantial fee.
There are no tolls between Marriott's Grande Vista Resort and Disney, Universal, or Sea World parks. So you won't have to deal with tolls again until you return to the airport.