Yes, you may use Marianne immediately on the next turn.

This scenario was released in August 2013 by Mayfair Games. Previously, the ten helper cards became the support cards in the “Star Trek Catan” edition.

You only get rid of Marianne if one of your numbers is blocked by the robber when it is rolled, so that you receive a resource via Marianne.

No. If you decided to keep the helper card after using it for the first time, you can't change your mind afterwards. After you have used the card a second time, you must exchange it.

It is irrelevant whether you obtain your final victory point via Candamir or via the normal procedure. If you have the victory points required to win the game, you reveal all your victory point cards - including the one you just received.

No.

It doesn't matter whether or not you or other players have a settlement or city adjacent to that terrain hex. You receive the resource because the robber runs off to the desert to spend some quality time with Lin until the next "7" is rolled.

Yes.

You must discard a knight card you have already played. As a result, you may lose the Largest Army.