What skills do I need to possess as a parent of a disabled child?

Understanding. Most important you need to understand your child's disability and what life is like for your child. You also have to become expert in getting the services your child may need. Books like temple grandon's different, not less can be very helpful to understanding not only the limitations but also the positive potential of your child with a disability.
It depends. There are various forms of 'disability' and so it depends on what kind of disability your child has in terms of parenting. Disabilities can be physical, mental and emotional. The department of social services may be able to give you more specific information and direct you resources in your community specific to your child's needs.