When I use the "activate squadron command" and have 3 squadron value for the ship Im using. Do I resolve the move/attack of the first squadron, then choose a second squadron to move/attack, then a third. OR do you have to choose which 3 squadrons youre going to activate at the same time.

I like the first option better because it lets you react to what happens. If your fighters are engaged with just 1 enemy squadron, and your first fighter kills it, then your other 2 can do something else.

Another question. Lets say I have an X wing and a Y wing which are both "engaged" with a tie fighter. The tie has to shoot at the xwing per the Escort rule. Does that mean that the y wing can move off, or do he have to stay engaged with the tie fighter?

Thanks!

All Squadrons are activated Individually, and completely resolved before the next one...

So you Choose Squadron One, Activate its Slider, Move and Attack with Squadron One...

Then Choose Squadron Two... etc.

If you are Engaged , then you are prevented from Moving. The only thing the Escort Rule changes, is who you have to shoot while engaged...

All 3, the TIE fighter, the Y-Wing, and the X-Wing are Engaged, and Prevented from Moving.......

However, if the Intel rule were involved somewhere, that would radically change the engagement.