Use the power of imagination only for your and others' good, and never try to use it to get something that belongs to others or hurt others. Make sure that what you are creating is good for all involved, and cause no harm to your environment.
Though the manifestation of your goal might sometimes happen in a sudden and expected manner, most of the time it will happen in a natural and gradual manner, one thing leading to another. If you desire money, it won't necessarily drop on your head from the sky or you will win it in the lottery. It will more probably come through a new job, promotion, a business deal or through various other channels.
Our thoughts and feelings, and the mental images we carry in our mind, affect our life. By changing them we change our life. This means that we have to be careful with our thoughts and how we feel about them, otherwise we might get things and enter into situations that you do not want, and then we will have to find ways to get rid of them. Better think and visualize what that we really and truly want, and which will improve our life.
Approach this mental work with a positive attitude, earnestness and faith, but at the same time with some detachment, and regarding it as a sort of game or play. This attitude will prevent inner tension and disappointment, if things don't happen as expected.
Define your goal.