Regarding Attack/Defense, this is as much as I will reveal on that topic:
- If attack (of the attacking unit) and defense (of the defending unit) are equal, the attacker will deal around 5 damage.
- If attack is 10 times greater, the attacker may score "instant kills" (10 damage).
- If defense is 10 times greater than attack, the unit doesn't take any damage.
All cases in between are, well, in between those extremes.
One final note: If your unit get's an attack bonus from terrain but the damage range doesn't increase, it will still have a higher average within that range.
Everything else is for you to figure out from experience.
Initiative is actually based on Movement (highest move first) but I think the order given is still correct.
Regards,
Anwar