You start with a small stage. A few characters, some minor structure. A town, a nearby forest, some caves. The ramshackle spaceport is the site of near-mystical action; when the rare transport comes in, everybody cranes their neck for a peek. As time passes, the characters gain in reputation and ability. And they outgrow their little corner of the world. Never let them be the biggest thing around; ambition should always be driving them to the next thing.