Divorce, alimony and children custody

I am married for 6 years now, my husband is unemployed and he is not interested in me since the day of my marriage, they are making my kids go against me I have two sons Elder 5 years old younger 3 years old, I am well educated (engineer)and worked in Amazon (alhumdulilah)before marriage, my husband and in laws do not letting me to work or to do anything without their permission for example they shop for my kids with my brother in laws money who is settled in Dubai, they have make only 3 suits till now to me, my husband didn't give me single penny only gives me 1000-1500 when I go to my mom's place and they donot allow me to go there for more than 2-3 days even if they require me, they mentally harassed/harassing me since my marriage, body shamed me, I was in depression right now m feeling better recovering on my own. I am living a maid's life with my own kids, I want to file divorce with my children custody and alimony is that possible, they hide food and do not let me eat making me starve, many times I feel dizzy but right now my health is much better, they make me sleep on ground in my whole pregnancy even after getting the furniture as dowry and after delivery also they demanded functions and cradles everything for my kids, knowing I was not well post delivery, I had a huge bloodloss my hemoglobin was around 4-6 that time.4 years back They falsely accused me and my parents for black magic which we donot do, that time they don't let my parents to even speak to me, there are so many mentally emotionally harrassed situations. They treat my elder child and younger child differently, which is not good for my kids mental health which is ruining now because of themx according to my husband and in laws elder child is the only child for them and younger child is like slave of elder child, because of which ky both children are suffering.How can I get children Custody and divorce