Manifesting is a natural and normal process but, since we have often been brought up to believe that achieving things requires time, patience and hard work, manifesting is a skill we need to develop. Like any other skill, it requires practice. Essentially, it is a mind-set, and we need to be thinking and feeling a certain way to get the manifesting process to work.
Be very specific
You need to have a clear image of what you intend to manifest. How does it look and feel, what is the experience of having it like? Try to visualize yourself in the position of receiving the abundance you desire. If you enjoy writing, then write a vivid description of what it is like. If you can paint or draw, then render an image of what you intend to manifest. Do whatever you need to do in order to get a clear, precise picture of what you intend.