Hi, and Welcome!
You're not the only one. I also had problems the first time, even in easy mode. I realized that when you stop playing this kind of games for a few years you lose some of your skills.
But don't worry: They come back. Check out the simulator missions, especially the gauntlets. After two weeks I managed to get past the prologue in medium mode.
I don't know which games you played before, but maybe you'll have to change your tactics, too. The AI likes missiles and they do a lot of damage. Dodging missiles is one of the important skills in Saga. And try to stay near your wingmen. No John Wayne actions, otherwise you are dead pretty fast!!!
-Aginor