Max Stats: I've seen a reference somewhere on the boards about this. I think it was from one of the CS beta testers. I do know that max values which can be entered are way off the scale for most situations.
Stamina: I have one NPC who has 20,000 stamina. It takes a long time to kill him.
Strength: PoG's Sea Giants can do 250 to 300 damage in one blow (perhaps even more.) So much depends on the stamina and armor of the playing character to determine if he will survive.
Dexterity: Anything over 100 means that the NPC will probably score on every hit.
Perception: Only of value to the NPC if he has a ranged weapon equiped. Again anything over 100 is probably wasted.
Morale: 0 (zero) means the monster will never run away from the fight. 70 means that the NPC will turn and run when he "sees" 70 damage points scored by the player on either himself or others. 500 means the NPC is going to stick around for a long fight unless the player can deliver damage in the hundreds.
Deb, I think your best bet is to use the "Random roll" feature and then adjust upward or downward from there. Type in the experience level at which you expect the player will confront this monster and then click the "Roll random values" button. Stage some fights with this guy and see just how hard he is to defeat. Adjust from there.