You can make a breakfast ADR before the park opens.
In Magic Kingdom at Crystal Palace, Cinderella's Royal Table, Tony's
In Epcot at Akershus
In Hollywood Studio's at Hollywood and Vine
In Animal Kingdom at Tusker House.
Call Disney Dinning (1-407-939-3463)
if you are not staying on property you can make ADR's 90 days before check in.
if you are a resort guest you can make ADR's at 90 days before your trip. On the first open day you get to make up to 10 days worth of ADR's.