I was just wondering what stats I should be focusing on for a Juggernaut and in what order? I was told

Power --> Endurance --> Strength and I forget the others but those where the main 3 I was told and in that order. I am also going for an Immortal build. Does anyone have a link to a good build? Any help would be appreciated.

No matter what spec that's for, that stat priority is borked.

Dulfy's Juggernaut Tank page. There's a decent starter build there.

But as a rule of thumb for any class, not just Jugg Immortal:

Tank stat priority:

• Primary Stats: Endurance > Main stat
  
• Secondary Stats: Mitigation ONLY (Mitigation stats = Shield, Defense, Absorb)
  

DPS stat priority:

• Primary Stats: Main stat > Endurance
  
• Secondary Stats: Power > Crit (*)
  

(* - although some classes do want some crit, so that rule is not 100% universal)

(ETA): Oh, and note this is just for Endgame or near to it. Gear doesn't start dropping with mitigation stats until around level 31 or so, so before then (Chapter 1), just gear like you would as a DPS.