Can/should I get representation from a reputable lawyer to navigate a personal injury situation resulting from an auto accident? How do I find one?

I was on a motorcycle and hit by someone in a car. They are liable and I am working with their insurance. They seem to be a bit difficult, and I am concerned that they said I have to submit all my bills and they pay at once and then it's over--no more coverage for future issues. I had a head injury (mild) and am concerned with my memory and don't know what the rules are here. Also, my regular medical insurance has paid most of the bills and I need to manage getting those charges moved over to the person's auto insc coverage without ending up with ME paying for all of it. Do I need help and should it be on contingency or regular hourly basis?