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Will it be a stable yellow dwarf like our Sun, or a volatile blue giant ?

Use the Habitable Zone view (shortcut 'H') to see where liquid water can exist. universe sandbox

Once your planets are in orbit, you can flesh out their history. Will it be a stable yellow dwarf like

Adjust the axial tilt to create extreme seasons or "tidally lock" a planet so one side is always burning and the other is always frozen. 3. Add the Details (Moons, Rings, and Life) universe sandbox

Here is how you can put together a story using the tools available in the simulation: 1. Set the Stage (The Star)