Squeeks1337 says:
I kind of feel like we're doing a lot of all of these things at the same time. Ultimately, the only way for the Sith empire to have a chance in the coming war is to begin taking worlds for itself. I see these groups as sort of advance scouts doing things to make the main Sith force having an easier time taking control of the worlds around our homeworld. This could involve diplomacy, setting the stages for alliance or partnerships, or subterfuge, sabotaging elements of a world making it easier to turn over to the Sith. I honestly don't see us just showing up and taking a world over on our own because any planet that we could take ourselves would not likely be worth the Empire's time.
Exactly. Squeek nailed it. Your group will be filling multiple roles as needed, depending on the situation. You will be given targets, orders at times. At times you may pick up on targets of opportunity. As part of the Sith military, however, you are not given free reign to just do what you want regarding major objectives, except for extraordinary circumstance (cut off from all communication, etc). As far as targets of opportunity, you will be expected (required really, by high command) to contact them, make your suggestion, and, if given the go ahead, proceed from there.
Regarding less large scale objectives, you'll have more freedom more often than not. If you're given the task of taking a planet, for example, without specifics, your group will be expected to do so in the way you deem best. If the plan becomes something like "let's try to secretly intimidate the planetary governor into becoming a puppet of the Sith, while we arrange for the demise of a few key politicians that would resist" you can try that. If your assessment is that the planet would best be taken by brute force, after sabotaging key defenses, do that; remember, you can coordinate with command and inform them to strike when the time is right. Long range scanners on the Space scale don't go that far, and a Sith armada of the appropriate size could be parked in a random part of the galaxy, less than a day out in hyperspace travel time.
You have a lot of options. Sometimes you will have very specific orders (for example, the beginning of the Conquest will have a specific system or planetary objective; due to the Veil and the Graveyard, the Sith aren't clueless as to the state of the galaxy, having had access to holovids, journals, and especially the data mined from the many explorers who ended up there, updated maps of the galaxy. Sometimes, you'll be more part of making the plan. Sometimes, based upon your assessment, you'll be able to make suggestions to high command. Like any military operation, it will depend. What you are not expected to do, again, is just go on your own and break things, so to speak. High command will want to be prepared for occupation and coordinate their forces.