Whatever things you have on hand goes in your "Stuff" box in your character sheet. This would include: Your weapons, your droids, your ship, and whatever else you have. You can get different things in several ways:
Buy it
You can buy things from someone else, from a store, a spaceport or station, a junk dealer, a cantina, you get the idea.
Take it from an enemy
If you capture someone you can take there weapons, there ship, or whatever they have.
Find it
Keep it somewhat believable.
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Torri Kayder