I had an idea for a Rebel battlegroup, but I don't know the stats of the A-wings or the Interceptors so this is just winging it. No pun intended.

3 X-wings

2 Y-wings

4 A-wings

Against

Star Destroyer

4 TIE Fighters

4 TIE Interceptors

1 TIE Advanced

There's literally nothing to go on here until you start providing more specifics. Star Destroyer stats don't exist, and any given model can be an inexpensive vanilla weenie with no extras, or an elite pilot with upgrades and skills and extra weapons that's worth twice as many points or more. So until you actually go into more detail, it's totally unintelligible.