Upon finding a world with the appropriate energies to sustain him temporarily, a herald of Galactus would summon his master and await his arrival.
However, after leading Galactus to countless planets, both inhabited and uninhabited, the Silver Surfer eventually found his way to Earth. His contact with humans, specifically Alicia Masters and the Fantastic Four, convinced the Surfer to turn against his master, leaving Galactus no choice but to punish his herald and travel the stars alone once more.
Here is a good question. If Darkseid is a god why does he only have one planet?