I cut my right forearm inside marshalls store. they were very rude and the ambulance were called. How can I find a lawyer that will take my case?

If it can be established through evidence that you were injured as a result of their negligence then u may have a case. However, if all u did was cut your forearm then your damages may be low unless you have some type of permanent damage to tissues. Take pictyof your wounds while still fresh and take pictyof the area or thing that cut u before the store removes it.