I don't think just imagining will do it for you, although it will help. Many of the things I've read suggest getting very, very clear about what it is you want in life and then writing it down. Keep you list handy and read it whenever you can. Maintain a positive attitude, feel good about yourself and your life and visualize yourself living the life you dream about.
If you consistently follow a plan similar to what I've explained above, you'll see big changes in your life.
You might want to check out http://www.scienceofgettingrich.net.
You can download the book for free. It's fantastic.
Abundance & Wealth Editorhttp://www.bellaonline.com/abundanceandwealth