You do need to get a referral from someone. A lot of workers' comp attorneys are very poor at communications, and tend to take a great deal of time to resolve cases because their case loads are too heavy. After I heard horror story after horror story about lack of communication I started questioning other attorneys (non-workers' comp) for their recommendations for my friend and found a great law firm for her. So ask around and see what you hear.
Also, once you have a name, check that attorney at www.calbar.ca.gov for any history of discipline.
many things affect the amount of settlement in wrongful death and survival actions such as the age of the deceased, the health of the deceased, the pain and suffering incurred, the liability policy limits, etc. therefore, without a full consultation and review of medical bills, it would be impossible to put a number on it.
you also just mentioned wrongful death action. what about a survival action? you most likely have one of those as well. you may want to consider speaking with an attorney to help maximize your claim in addition to properly apportioning proceeds between wrongful death and survival actions to decrease inheritance tax liability.
final note, you will need to petition the court to approve the settlement of a wrongful death action. It's normally called a Petition to Settle Death Claim. you may want to consult an attorney to have these issues more fully explained to you.