I plan to create a map involving a rocket that will blast off at the end of the round, like doomsday, but i have no idea how you make the actual rocket go off.
I don't know how to use path_track, but ill try func_tanktrainThe rocket flight in Doomsday is an animation (i.e. the animation is set on a prop_dynamic). If you need a different flight path, do what henke said (probably want to look at func_tracktrain and path_track entities), or go down the path of learning how to animate.
The screen flashing, blast smoke, and sound effects are accomplished with separate entities. This Special Delivery Prefab has almost everything relevant to the Doomsday launch. Start with the red_win or blue_win logic_relays to see how it works.
Yeah, use func_tracktrain with model parented to it, like this (launch at 1:55):
Just parent the model to a func_rotating/func_door_rotating that in turn is parented to the tracktrain.