Nu of Nooit

Yes — you may pay either your own or another player’s specialist to take its specialist action, following the payment and recruit rules (p. 9).

No — a flipped specialist is exhausted and cannot be used until it is rested/flipped back face‑up by the appropriate action or effect (p. 9).

You can place buildings on the designated starting town spaces following the build rules; the rulebook explains how those spaces work and the costs/icons that apply (p. 11).

Villagers are refilled as part of the production phase and certain anytime actions let you place villagers into housing or complete orders; you do not need a specialist action to refill during production (pp. 15–16).

Yes — to visit a location you must move onto that location’s space (end your movement there) and then take the location’s visit action as described in the movement/visit rules (p. 12).

If you retreat you end the fight without the enemy’s defeat rewards and instead resolve the retreat outcome and any associated consequences; defeat (not retreat) grants the normal victory rewards (p. 13).