This is a good place to start when beginning to learn about the Law of attraction and how manifesting works. I like to come from the science side as it welcomes all faiths. Thoughts are like music. With every thought attached is a vibration or frequency. When you think something positive it sends that frequency out into the universe and anything that is on that frequency will begin to show up in your life.
There are some variables that also affect this which can be learned through my life coaching course on the law of attraction.
Starting to monitor some of the 65,000 thoughts you have a day may seem quite overwhelming so it is easier to start with knowing what you want.
Start with one thing that you want in your life and start to visualize and picture it. When you do that it will start to send signals out into the universe to bring what you're thinking about into your life.