Hi! Thank you for buying the game and giving it a go! I’m glad you’re enjoying it.
As for your rules questions:
- Coastline is only drawn around landmark dice, not biome dice. The explicit rule for that is written on page 20 - step 2 of the exploration phase.
- Yes, cards are discarded after use. Each time you travel to a new location you should draw a new card from your deck, refer to the prompt and then discard it.
Hope that clears things up and happy map-making! :)