Dear Sir,
1. You may file for a divorce in any court in India (but a family court)
2. If you opt for talaq-e-ahsan or talaq-e-hasan, you need not give a reason, but you will have to pay dower
3. If you go for mutual consent divorce, then the wife may waive off the dower amount (if it is unpaid)
4. Yes, you may go for second marriage as that is permitted. You need not have to prove it. Just get your marriage certificate registered.
5. "Talaq-e-Ahsan" is the 'most proper' form of talaq in which the husband expresses divorce in single sentence - "I have divorced thee" - during the period of tuhr (when the wife is not menstruating) and then has to wait till the iddat period is over. Iddat period for a woman who has been divorced by her husband is usually three menstrual cycles. During this time, she cannot marry another man. If before the completion of iddat, the husband resumes co-habitation with his wife or says that "I have retained thee", the divorce is revoked.
In case the woman is pregnant, the iddat period lasts until she gives birth. The waiting period for a woman after menopause is three months.
"Talaq-e-Hasan" is the 'proper' form of talaq. In this form, three successive pronouncements of talaq are made by the husband in three successive tuhrs (when the woman is not menstruating). In case of a nonmenstruating woman, its pronouncement may be made after the interval of a month or thirty days between the successive pronouncements. This form of talaq can be revoked any time before the third pronouncement.
6. If you go for talaq-e-ahsan or talaq-e-hasan, it will take 3 months for the divorce to finalise
Thank you