Ok. Let me help you on the basis of personal experience. After obtaining the Affidavit from competent authority you apply to the concerned higher authority (generally, BDO in rural areas/ SDO in urban areas) with an application. After that they will provide you a requisition slip for that particular purpose (Legal Heir Certificate). They will ask for some credentials like proof a lineage, citizenship, domicile certificate, relationship with applicant, ration card and other documents. Then after verification they will ask for subscription fees. After submission of everything they will issue the slip which you will have to keep safe for the time of hearing. After that they announce a date of hearing for certain cases. You will have to be present on the date of hearing in person along with all the credentials in original to review your claim. Process and system of work may vary from region to region.