You may get a formal certificate from Arya samaj bhavan and same may be registered if adviced at Municipal crporation.same is having recognition.
Court marriage is different and has waiting period
Lawyer fee can be only be determined by lawyer himself. we can't presume or guess fees of lawyer. You approach lawyer and if affordable then only give a brief.
You may review judgement before same bench of High Court or may challenge it before honble supreme court
Ans : Legal heirship certificate can be asked by local authority ie Pune Municipal.
Ans : Where the property is situated..what are the arrangement made in partition.is required for solving your query.
Ans : You may affirm an affidavit for showing that you were married. But adding , no divorce petition can be entertained within a year from date of marriage . So.u have to wait
Ans : Due service of notice is required , but due to covid -19, no harsh order are passing right now.
Ans : Partition suit can be initiated for getting share if there is denial to do partition.
Ans : You can challenge his actions and may seek declaration as to sale deed and can also pray for injunction , provided that if you have interest vested in property.
In my view, Will cannot be registered if the executant died. Will does not required to be registered
You may get the probate from appropriate court or may seek declaration in respect of it.