Om Swami
What should I do first to prepare my heart for bhakti?
Purify the heart as God's seat
Think of your heart as the seat where you want to place God, and keep that place clean and pure. This is real bhakti, and from here one progresses towards para bhakti, and from that one attains God.
Just like I clean the seat for myself, the place where I want to place God should be clean and pure. This is real Bhakti.