In T3, you hit things by making attack rolls, pitting your skill against their Dodge. If you fail to match their Dodge, you miss, and there is usually no effect. If you make it, add the Outcome to the Damage Value of your weapon, and the result is the damage of the attack. The target then gets to subtract his Toughness or Armor Value, and the final result is the number of Wound Points he takes. If he is tough enough, he might take no damage at all.
This is the normal procedure. Many schticks have special rules that change some or all of this.