Kumar to get to the stage you need to be at, what you first need to consider is what is best for you in the most practical way possible. Wanting to get your ex back through the use of magic is not going to help you, it will only serve to hurt you more. I know it is painful but she would be the only one who could make that choice, you alone can make attempts but ultimately you cannot "make" her come back.
On the subject of magic and learning spells on the other hand, I would invite you to check out some of these links as they will instruct you better on the site and how to get a grasp of the basics such as meditation, visualization, grounding, centering and casting a circle etc. Please spend a lot of time reading and researching, it's not something that can be learnt over night, but one thing that's better than getting there is the exciting journey learning magic brings into your life, enjoy!