Ok This is how it's going to work.
Race W gets 15 Vitality Points at first level, plus 1 point for every character level
Race X gets 13, plus 1 point for every character level
Race Y gets 13, plus
Race Z gets 10, plus
Damage effects your Vitality 1:1. No weird math.
If you Crit (Roll three of a kind) the damage goes straight to your Wound Points.
Once you take any Wound Damage, you are Staggered.
If you move on your turn, you get a +1 to your AC until your next turn.