need help trying to make a game

Hi, Trying to make a game where you use the arrow keys to move a person their in a grave yard and when their .2meters from the Tombstone, the tombstone falls and coins come up.

This is what i have come up with so far,

When Trying to get the TombStones to Fall Down when Ghost is within 1meter and coins come up, and Start a Counter. Random number of coins per TombStone,

And a Hole in one of the Tombs but that Change Per game.

Any Idea??