What are the things needed to be done on a social security disability and Medicaid application?

In applying for my son's Medicaid Insurance, I and my spouse have come across some questions. He's a twenty-five year old adult with a developmental disability and is currently living with us. He's been approved for services through OPWDD and we had to apply for a need for service Medicaid which specifically covers his needs. We need to send the application in as soon as possible and it requires an abundant of information from all household members, (this includes bank accounts, real property ownership, etc.). We need some direction on how to handle this, and if we might need some legal advice to reach a positive conclusion with this matter.