Thank you!

If not then hire one of the lawyers that get paid when you win. If your child is HFA that is the they alwasy refuse, so you will need a lawyer

Yes, contact the social security office administration for your county and/or view it online. You can fill out the application online or mail it in. It goes a lot faster if you already have a diagnosis. If you do have a diagnosis for your child, then you should get it within 60 days.

After you apply it can take between 60 and 120 days to complete and process. So if it's something you and your child really need you should start as soon as possible.

You don't really need an agency, you can do it by yourself. It is not complicated, you just have to fill the application out. Here are some links that will guide you:
http://www.ssa.gov/disabilityssi/ssi.html

http://ca.db101.org/ca/programs/income_support/...