Namaste Abhishek,

I am trying myself best from few months to understand about the Hindu gods in detail. Saw your query for Lord Krishna. Lord Krishna is the dominant avatar of Lord Vishnu. You should watch the Ras leela i.e divine play of Lord Krishna. You can also perform Japa by chanting Krishna's mantra. you can refer the below link for mantra and to know more about Krishna in detail.
http://www.rudraksha-ratna.com/lord-krishna.html