Any time we say "Let There Be" on any level, in any way, something will happen. It's as if there is something in us, all around us which detects our every thought, word, deed, belief, fear, desire and command and does something about it.
We really need to be aware of the power of our words. After all, in the beginning, in Genesis it reads "And God said..."
It isn't the same as wishful thinking or idle day dreaming we unconsciously spend time doing. If your dream is to have a successful business then it would naturally involve lots of small desires that would be worked toward daily or even changed moment to moment as you work toward your goal and final objective.