What does it mean that my dead uncle visited me in my dreams. He told me listen to him and pay attention. Look to the right.?

It means the same thing that all dreams mean. That is to say, pretty much nothing. Dreams may indicate that you're concerned or worried about something, or at least that you think about it a lot, but that's all... there's absolutely no validity to "dream interpretation" that treats the object in the dream as concrete actual objects. The fact that it was your uncle probably has more to do with how you feel about your uncle than it does about he himself.