1. Correct. Gollum was not the Guide at the point at which the card could have been used.
2. The use of the card is optional. It says to discard it to draw another Hunt tile. If you don't want to draw another, you don't have to discard the card.
Thanks. You've convinced me with your answer to #2. It just makes more sense on reflection. It wasn't critical to the game I played, but good to know.