Sea World is approximately the next stop. The bus route is basically I-4 from Disney (TTC) to the Sea World exit; there may be one or two Lynx bus markers after you exit I-4 but before you turn to pass in front of Sea World itself, but the correct stop will be pretty obvious.
At the TTC, the Lynx stop is located (as I recall) at the far end of the platform. Exiting the monorail or ferryboat, head out of the TTC towards Mk parking and bear left around the gift shop located at the corner. You will then walk straight to TTC bus parking. Stops are marked; the few Disney buses which still service the TTC are nearest. Again, the Lynx stop is to your left at the far end (but its actually very close). More than one Lynx route calls at the TTC stop, so be sure you get on the correct bus (the second will take you out U.S. 192 to Osceola Square Mall).