On the East Road just out of Hobbiton (past the woodsman
who trades his dagger for pipeweed), on the ledge above
the stumps that summon the elves is a house.
Enter it and walk up to the bookcase.
Press [Action] and a gold coin will appear. Leave the house
and re-enter. Another gold coin will be there.
Repeat this to get as many coins as needed.
In the level Troll Shaws, there is a way to kill trolls easily. When you encounter a troll, go into first person mode and walk backwards. Go off the road to your left until you can't go any farther. You will be in between two rocks. The troll cannot attack you, but will just walk up to you and spazz out. All you have to do then is keep shooting arrows into it until it is dead.
This works for other enemies in this level, too.