Divorce on grounds of adultery

In 2015, I found out that my wife was cheating on me, when I found a s*x video on her phone. Investigations over the next few months proved she had s*xual relations with at least 2 men; had shared explicit and naked photos of herself with 2-3 men and was also indulging in s*xual chats with 4-5 men. I went through deep trauma for few weeks and had to undergo counseling. The total process of trauma management took over 1 year. As I have small children, my wife still stays in my house. She has a job earning approx the same as me. My queries are: 1) Can she be forced to pay for half the domestic expenses if she stays with me in my house 2) Since I have the proof / evidence in the form of video, how easy or difficult is it for me to get divorce on grounds of adultery 3) If we divorce, can I get full custody of our children on grounds of immoral behaviour 4) After divorce, with full custody, can I ask for continued payment for the expenses towards my children