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If an effect would be created that sets the base power and/or toughness of a noncreature permanent, or otherwise modifies its power and/or toughness, that effect is created even though it doesn’t do anything unless that permanent becomes a creature.

Some artifacts have the subtype “Vehicle.” Most Vehicles have a crew ability which allows them to become artifact creatures. See rule 702.122, “Crew.”

Crew

Crew is an activated ability of Vehicle cards. “Crew N” means “Tap any number of other untapped creatures you control with total power N or greater: This permanent becomes an artifact creature until end of turn.”

A creature “crews a Vehicle” when it’s tapped to pay the cost to activate a Vehicle’s crew ability.

If an effect states that a creature “can’t crew Vehicles,” that creature can’t be tapped to pay the crew cost of a Vehicle.

Some Vehicles have abilities that trigger when they become crewed. “Whenever [this Vehicle] becomes crewed” means “Whenever a crew ability of [this Vehicle] resolves.” If that ability has an intervening “if” clause that refers to information about the creatures that crewed it, it means only creatures that were tapped to pay the cost of the crew ability that caused it to trigger.

You can cast Armed and Armored even if you don't control any Vehicles or Dwarves. Whatever part of the effect that can happen does, and the rest is ignored.

The set of Vehicles affected by Armed and Armored is determined as the spell resolves. Vehicles you begin to control later in the turn won't automatically become creatures.