wow I didn't know it was that complicated...
I'm surprised the atty fee wasn't taken out already... they usually make sure to get that - right off the bat.

double check on this before you give atty any money.
I think I would call or email the SSI / SSD and ask them these questions just to be sure you get the best answers.
If you can email then the reply will be your record to look back on and you won't have to take notes like with a phone call.
Or maybe there's a booklet with the details they can send to you.