In the first 'proper' mission, a good thing to do if you're struggling is bait the TIEs away from their Gozanti's and the Light Cruiser.
Then once you nobble them, max shields, zip in nobble one Gozanti and get out again.
Repeat once healed
Help the CRV's that rock up finish the light cruiser now its target fixated.
You won't get many of the 'medals' doing that, but slow methodical play of the missions can help massively.
It becomes easier once you get access to the armoury and wingman commands.
Then once you nobble them, max shields, zip in nobble one Gozanti and get out again.
Repeat once healed
Help the CRV's that rock up finish the light cruiser now its target fixated.
You won't get many of the 'medals' doing that, but slow methodical play of the missions can help massively.
It becomes easier once you get access to the armoury and wingman commands.