I think the first major step is to decide which "angle" you're going to play the campaign.
Do you want to focus on running a Jedi campaign? A Sith campaign? Do you want to run Republic loyalists or do you want to run adventures for a group of fringers, smugglers and pirates who live from job to illegitimate job?
Do you want to focus on exploration of new regions, worlds and cultures, or do you want things to be more centered on the well-known and developed core worlds of the Republic?
There's plenty of ideas, so what you need to decide on is what direction to focus your game. Once you've come up with your basic "theme", then we can help you come up with interesting ideas about the kinds of stories you can weave.
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