This is a promising start. Coins are little works of art and, if you find a particular denomination attractive or impressive, you will derive great pleasure in finding out more about it/them. Read about them as people have said, and the fascination will develop. I think you will get greater pleasure from collecting rather than investing and people's love for their particular subject just sings out from contributions on this forum. Half crowns have some of the most beautiful artistic designs seen on British coins.