An attorney usually charges a fee and it's generally taken out of the proceeds.
Did you pay your atty up-front or did you make other payment arrangements when you signed up?
PPD = permanent partial disability. Many states pay additional benefits when recovery is incomplete and the worker is left with lifelong restrictions. The amount is computed in weeks of payments at a particular rate with the higher the impairment rating resulting in longer period of payments.
you can read more about Iowa's benefits here