Child custody

I am yAsmin shaikh Muslim aged 33, my marriage took place in Dubai 12/12/12 , me n my ex husband stayed in Dubai with my parents even after marriage for 3 years. after my husband termination from job i moved to Bangalore where i stayed in my parents home and after 5.7 years of struggle and abuse i took the decision and ended the marriage through khula in shariah court in masjid on 23/2/2019. during khula he kept condition that he will accept my khula only after he gets child custody and i was given a draft and forced to write and sign as legal formality (plane paper). later i moved to Dubai again coz i was alone. i m working here. i am in contact with my ex husband brother and his wife coz they takecare about my child. they have informed me that my child is not taken care properly and his father leaves him often n travel. there are many things which i will discuss later. i want to file a case my son is 6yrs 2 months old. PLEASE GUIDE THE PRCEDURE MY EMIAL: [deleted]