I think the following website is good place to start ; 3 Tips for Controlling the Subconscious Mind and Taking Control of Your Life
The subconscious mind is sadly a mystery to the general population with the majority of people unable to explain just what it is that their subconscious actually does. When you consider that our subconscious mind is responsible for not only running our bodily functions as an engineer runs a ship but also performing multiple, simultaneous actions and maintaining habits, it is very surprising that more people aren’t aware of the power within their skulls.
Successfully utilizing the power of the subconscious mind is the key to living a successful life and I shall explain why I think this is so in the following paragraphs. Please join me on this journey to discover the power of the subconscious mind.
Imagine a young farmer sitting in his newly acquired farmhouse, considering what best to plant for the coming planting season. He would most assuredly choose those vegetables that would bear him the most rewards, and once having done that he would then proceed to prepare the soil and make sure he had all the necessary resources available to him for the successful cultivation of his crops.
You are the farmer, your subconscious mind is your land, your fertile soil, and your thoughts are the seeds that will either grow into lush fields of vegetables or strangling, creeping and ugly weeds. That is the nature of the universe; everything starts as a seed, an idea which in time grows into a form, a form chosen beforehand by the creator, the evidence is all around you, no matter where you look. As the creator, you are responsible for controlling the subconscious mind, and when you do so you reap unlimited benefits.
“Whatever we plant in our subconscious mind and nourish with repetition and emotion will one day become a reality .”— Earl Nightingale
Subjective Thoughts Are the Seeds
Although we know that thoughts have power and can become “things,” it is important to understand the difference between an objective thought and a subjective thought. An objective thought is a result of general thinking, such as reasoning, the process of recollection or study and there is no feeling involved, therefore it cannot enter or control the subconscious mind. A subjective thought, on the other hand, can enter the subconscious mind as long as it is impressed often and with sufficient feeling, which we often do quite easily when worrying over something. Affirmations infused with emotion would be one way of successfully tapping into the power of the subconscious mind if repeated on a daily basis with passion and vigor.
You have been sowing bad seeds in your unconscious; now you will sow good seeds. The power by which you have produced these ill effects will in the future produce equally good ones.— –Emile Coue