What causes the gas pedal to stick in the mornings after the ignition is turned over But after a couple of tries it finally works and is good for the rest of the day?

Many vehicles especially the carbureted ones have automatic chokes which hold the engine idle a bit higher than normal until the engine warms up, its to help warm the engine. I dont know what you mean by sticking, does it stick at full throttle or half? then some lubrication to the throttle cable is necessary. If its what i mentioned first off then do nothing, let it warm up for a bit then step on and off the pedal once quickly and that will make it go into slow idle.