1. You can certainly file a divorce suit in USA which will be disposed off within a very short period but the said decree of divorce granted by the foreign court will not be acceptable in India unless it has been obtained on the ground acceptable by Indian Act. So, there is no point taking a divorce decree in USA when she will legally stay as your wife as per Indian Law. moreover, as per law of some of the States of USA, wife will get 50% share of husband's property or huge amount towards alimony as decided by the Court. If you never want to return to India and do not want to marry in India again, then you can go for decree of divorce to be passed by USA Court.
2. No, Court will not provide you its English version which you shall have to arrange. there are Court approved translators whose service you can avail.
3. Your present lawyer shall have to endorse the Vakalatnama you will execute in favour of your next Advocate by giving a note 'No-Objection'. Such note will be given by your present lawyer only if all his dues are cleared. If he refuses to endorse the Vakalatnama, you can issue a separate letter to the new Advocate stating that the other one is not endorsing it even after collecting all his payments for which you are directly engaging him as your Advocate.