• Evidences and witness statement

My wife filed a divorce case and pressed charges of Adultery , desertion & non responsible husband . The case is filed at my home town 1000 km away from the place we currently stay. All these charges are false and I have documented proofs , recordings and witness for the same. 

THE BACKGROUND: In reality she was careless and irresponsible mother. Since my son started going to school ( age 5) she completely stopped caring about him. Initially she use to be at home but it was always me who use to get him ready , get his tiffin ready , send him to school , pick him , bath him , feed him , play with him , feed him in the evening and eventually put him to bed. She would not care for child at all and leave him up to me or maids .She would be busy watching TV or surfing internet. Later she started working and would go to office at 9:30 morning and will come back only at 8:00 PM leaving all child care on me. This became the major issue and after several fights one day she left the house with my son ( now 6.5 years) and failed the divorce and prayed for child custody on the ground of adultery . I have filed the RCR and now planning to file for child custody as well. 

Questions:
A. All the maids (3) and My Driver have witnessed how she used to treat my son . Apart from them my neighbours are also willing to tell the truth. The case has been filed in different place where it may not be possible for these people to travel . What are the way to take their statement which will be admissible in court ? Can I take them in front of a magistrate and record their statement ?
B. School is willing to give in writing that she never attended any of the open school , sports day etc. what format should I get it from school that will be effective in court ?
C. I have Audio recording of her aggressive behaviour will it help in my claim of child ? is that admissible in court ?
D. I was denied physical relationship and as an act of desperation I have exchanged few emails with unknown women from adult website as well as put up my profile on one adult website. I also have exchanged few emails with escorts and discussed the cost / availability etc. However I never was in face to face contact with any one . My wife might have an access to these emails , is it good enough to prove Adultery and win the child custody