Zombicide: 2. edycja

No. You spend 1 additional Action for each Zombie in the Zone you’re leaving; entering a Zone with Zombies also ends your Move Action. (Rules & Missions, p. 19)

The first time a building is opened, draw a Zombie card for each Dark Zone in it and place the indicated Zombies. Buildings open at the start of the game, or containing Survivors at the start, are not spawned in. (Rules & Missions, p. 20)

Not freely: ranged hits follow the Targeting Priority Order—Brute or Abomination first (the shooter chooses between them), then Walkers, then Runners. Melee hits don’t use that order. (Rules & Missions, p. 28)

Yes. After all Zombies resolve their first Action, each Runner gets a second Action to attack if it shares a Zone with Survivors, or move if it doesn’t. (Rules & Missions, p. 25)

Yes. Each Survivor counts as a Noise token; Zombies first target a Zone with Survivors in Line of Sight that has the most Noise, and if they see none, they head toward the noisiest Zone. (Rules & Missions, pp. 14, 24)