You don't need to have exact change at most of them there is someone there that can change your money (some of the side road off ramps are exact only and are usually .25cents, but all the main plazas have people). The cost depends on what road and where your heading. The tolls range from .50 cents to $1.25 depending on the toll plaza. To get from the airport to WDW for example will cost you $2.00 (as there are 2 seperate $1.00 tolls...if you come down the Greenway/417 and get off at the exit for Epcot... it would be more if you go all the way to the MK exit as there is another toll plaza...best to get off at Epcot and just follow signs on property).
You should definitely bring change, as at night some booths are unstaffed. And, from experience, let me say that it's unsettling to have to approach speeding cars in an unfamiliar state and ask for quarters.
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