TREASURE ISLAND : ROBERT LOUIS STEVENSON

Can you help me answer these questions?

1. What is the symbolism of the treasure?
2. What are the obstacles they faced as they journeyed to find the island?
3. What attitude/significant character and from whom helped the, achieve/not their goals?

I REALLY REALLY NEED THESE FOR MY PROJECT OR ELSE I'LL FAIL. CAN YOU PLEASE HELP ME?