It said that you may attack squads with a ship at its hull range. All ships attack with 1 or 2 blue dice (more from the back) Does this mean that a ship with no blue dice can attack from that hull? Does this mean if a hull has red dice it can attack at red range but with blue dice?

Ships attack squadrons with their anti-squadron dice.

Those are listed separately.

All current ships have 1-2 blue dice for anti-squadron work.

Also, unlike your battery armaments that have different dice for each hull zone, your anti-squadron dice are the same, regardless of which hull zone you are shooting from.

And remember you can shoot at any and all squadrons within one arc.

And remember you can shoot at any and all squadrons within one arc.

And within range.

It said that you may attack squads with a ship at its hull range. All ships attack with 1 or 2 blue dice (more from the back) Does this mean that a ship with no blue dice can attack from that hull? Does this mean if a hull has red dice it can attack at red range but with blue dice?

The markings on your ship bases aren't saying they get more blue dice in the back. That little box you're seeing in the back shows what their anti-squadron armament is from any side they shoot squadrons from. Think of it like the hull rating listed in the same area -- the hull rating doesn't apply just to the rear quadrant, and neither does the anti-squadron value.