Adoption of my wife's child from from previous marriage

Hi, I have some doubts about my situation now and need clarification on it. I am Divorced getting married in May to my future wife who is also divorced and have a 4 year old daughter from her previous marriage. and i have a plan to adopt her child and as i work overseas i want to apply childs passport under my name and also have my name on birth certificate. Below are my questions: 1. Do i need to wait to start adoption procedure until we are married or i can start process before marriage? 2. Can i get NOC from biological father for child adoption before four marriage and before filling adoption deed? 3. Is the presence of Biological father required at any time during the adoption procedure or just the NOC is sufficient for adoption? 4. Can i get the child passport issued under my name before the adoption is complete ? 5. Can i change childs fathers name on birth certificate once the adoption is successful? 6. what is the time it takes for this adoption process from start to end? 7. What all are the cost involved and how much is the rough amount including the lawyer's fees? Please help.