This mission is really simple. You actually need only few Y-wing squadrons to win. Once you arrive, target tractor beam of enemy destroyer with your bombers. Ignore all remaining ships. They will be surprisingly idle. When your Y-wings destroy tractor beam, Han Solo will jump out of the system. Congratulations, mission is over.
Now finish your work in Corelia and capture the planet surface. Another system becomes active, and since you have nothing serious to do, send Han Solo there to begin next mission.