Radhey Radhey,
Radhey Radhey,
This is a very big question, and to answer it, you will have to understand carefully the basics of the devotional philosophy. In order to correctly guide you, my best recommendation is for you to read Prem Ras Siddhant by Jagadguru Shree Kripalu Ji Maharaj. This book will give you a proper knowledge of the basic concepts of Hinduism, and then the answer to these questions will become obvious to you.
Nikhilanand Bhaiya