The tribes are usually lead by a charismatic shaman or a goblin mage. Hit points are the number of damage points the thing can take before it dies. Armor Check is simply another name for armor class. Exp. is the number of experience points the character wins from fighting the creature. The number after the name of the combat skill is how much points the skill costs to use.
Strength applies to bonus hit points and damage points.
It is also used when a character's strength is needed for a certain task. Agility applies to a subject's bonus armor check, and the number a character must roll on in order to run away from the creature. Agility is also used for dodging certain traps, and spells. Intilect applies to the character's bonus battle points, and the bonus number of combat skills. Charm applies to a characters recruiting skills, his persuasivness, and the ability to lead.