Where did Genes Come From?

So, I was wondering. Let's assume that evolution is a good theory in that it describes how lifeforms came to be what they are. That theory uses genes to propagate life. But how did the genes initially come to be? They couldn't have evolved in the same way because there were no genes to use to do so. Ok, let's say there were genes for the genes, some kind of meta-gene, but where did they come from? And so on, and so on. So, maybe this isn't a new thought, but it seems to me understanding how different lifeforms come to be requires not only evolution, but also how the underlying mechanism that evolution uses came to be. Therefore, the theory is not complete.