[OT] Copyrighting games?

[Richmond]

I have recently invented a tiling game that can be produced as a 
physical game and as a computer game.
This involved a lot of thought and a lot of work, and as a result I 
would like to try and make some money
out of it rather than just "give it to the world".

However, never having copyrighted anything except a book in 1985, I 
don't know how to go about this.

My main concern would be, initially at least, within the European Community.

I would be grateful for any advice anyone can give me.

Richmond.