Go through your life and actually look at the abundance which is all around you. Grains of sand in the desert, raindrops on your window, snowflakes in cold places, blood cells in your body, people in the world, and so on. Making a start like this and actually noticing the abundance which is already here, is a start and will attract more to you. It shows that it is definitely possible (it certainly is in Nature, just think of the air that you are breathing) and it can be in your reality too. Then go through what you would like, and affirm or visualise it so that you have plenty of it. This then gets you into the habit of putting your attention onto the abundance of what you desire, rather than the lack of it. The Universe then responds to this new vibration instead.