To answer your questions:
1 - If a wolf would deal 1 Wound as a counterattack and its Damage modifier is −1, you don’t need to mark a Wound.
2 - For one-sided ranged combat, roll 2d6 + Agility:
- 10+: The opponent marks two Wounds.
- 7–9: Choose a complication:
- Reduce your ammo to one last shot.
- The opponent marks one Wound, and they close the distance for a potential future counterattack.
- -6: Reduce your ammo to one last shot, and they close the distance for a potential future counterattack.
I hope this clears things up.