Start in mos eisly the same co-ordinator as act2 in the tents by the slums, he will give you a wp on either endor, dathomir or yavin4 to speak to a guy for info on a caravan.
I had yavin so the guide will be based on this
Go to the planet given and /conv with the guy at a distance of 65m first, then get in closer to converse properly. Do not ask about the caravan at any point until he brings the subject up himself. He will then give you a repair kit and a new wp.
Go to this wp and talk again to the person there, he will give you a broken item that you use the repair kit on then converse with the person again.
Go back to the co-ordinator in eisly and he will send you to the tactical officer in the guild hall.
Talk to the tactical officer and he will send you back to yavin (wp given may say -8190 -8190, this doesnt matter just go to the planet)
On yavin you will have to destroy a warehouse. outside is 2 guards (blue con) and inside 6 guards (8-10kham). kill them all then open the container to collect 2 pieces of flora. now set the destruct sequence on the warehouse and return to the co-ordinator in eisly.
He will now send you to yavin again to speak to leia (how she can be on 4 planets at once is beyond me)
Make a note of the wp to leia because if you fail her mission the wp dissapears from your datapad
leia is at -4238 2277
leia will ask you to defend a base and that you may require assistance
go to the wp given to find a base with a handful of rebel troopers around it. 3 waves of stormtroopers will walk in from all directions all with 9-10k ham. the rebel troopers are not tough enough to handle these alone and if they die you fail the mission.
the badge may take upto 10mins to appear so dont worry.
I havnt tried this yet but if you give the flora to the co-ordinator you are given extra faction points, or you may keep them to yourself.