It needs to be reasonable per the rules. You cannot start with owning a huge business that rakes in the credits but you can have a family heirloom or two, a ship, or other things that a reasonable middle classed person might have in the Star Wars universe.
As far as I understood, the site doesn't really care about player economies (startling loadouts need to be reasonable though). But I think having a super successful galactic enterprise right off that bat is getting close to mary sue territory if not in it.