Some thoughts!
If you wanted to end up as Sith, I'd sooort of rather you not start off as one, but instead develop into it over time? I mean, they're extinct, after all, right?

Likewise for a Jedi, because Jedi wouldn't entrust one of their own to the Empire when they can handle their prisoners internally.
If you wanted to be Sith, I would be interested in seeing what you would develop absent the force-user tradition that is
exclusively derived from Fallen Jedi. The Rakata used the dark side to fuel their empire for aaages without ever running into problems, right?
A rules-light system would be best just to let you grow and develop in an organic way rather than following a build or anysuch (and if you want to be a twi'lek pilot/lightsaber-swinger, you don't have to make tradoffs toward one or the other), so FATE is an interesting idea to me.
We ... aim to misbehave? 
Though I think the setup is pretty much perfect for a 'needs must' mixed group with their own agendas that happen to be compatible, whether more light or dark-inclined.
Precisely so!
Re: are you the good guys or the bad guys, that's a more complicated question than it first appears. One of my goals for antagonists is called the
Ideological Turing Test. What it boils down to is that, if the bad guys somehow broke out of the world and into ours and they were writing their own segments instead of me, would you be able to tell? The upshot of that is that the antagonists never really got the memo that they are the bad guys, and thus will try to act in ways that are consistent with their beliefs. They'll go and do terrible things, but they'll feel they have excellent reasons for them. Even when they don't. In fact,
especially when they don't.
So,
are you the good guys? The bad guys? Or just the guys with the guns?
The one thing I can say with complete certainty is that you will be rebels, which means that the reigning authority will definitely label you bad guys, and people who hate the reigning authority will probably label you good guys.
(obligatory "from my point of view the Jedi are evil!")
Hm, a potential point in favor of you being good guys is that the likes of Obi-Wan/Ahsoka Tano/et al probably
wouldn't stand for the Jedi becoming the boot on neck in the name of galactic security and peace. Of course, see the above bit where Jedi handle their prisoners internally...
Anakin, on the other hand, was probably presented to the council, who heard "bring balance instead of us being in charge for thousands of years" and quietly had him smothered with a pillow. You know, like goddamn sensible people.