namaste, pleasePlease note that there is no such shloka in bhagavadBhagavad-gita. you have mixed up couple of shlokas. also to say god made this or that is creationism theory which is not from our shashtras. in bhagavad-gita atma is said to be unborn, eternal, indestructible, immutable. also prakriti and purusha are both anadi - unoriginated.
lookingLooking at uryour question, it seems that uyou do not know much about dharma or shashtras.
anywayAnyway, lets start with mind. one needs to understand fully what this mind is. to do that a simple technique is to look at everything which is around you with wide-vision and then see the 'seer' who is observing all this. alsoAlso see how all that one thinks is in mind. this needs to be explained in more detail, so if u are interested my email is ombaba123456@gmail.com