Thank you all for explaining. Reading your explanations I think I already knew how to do it. I just thought that what I was doing is not visualization, because it was more like dreaming and daydreaming. But I'm gonna work with what I can already do and train to get it more detailed, more vivid, try it in more situations.
Bene, I totally agree that everyday thoughts are extremely important. I know and experienced the power of negative and positive thoughts. Your own thoughts really make the world a different place.
For Acting Like Godot, I will try incorporating other senses in visualizations. Music is my strong point, and I have no trouble hearing detailed music in my mind.
For wolfgang, the chakra exercise seems really worth a try. I have been trying chakra yoga, and up til now, I don't really know what to think about it.
Thank you for the information! You helped me a lot!